Drought Conditions for Nassau County
people in Nassau County are affected by drought
of people in Nassau County are affected by drought
wettest March on record, over the past 131 years
driest year to date over the past 131 years (January-March 2025)
The U.S. Drought Monitor depicts the location and intensity of drought across the country using 5 classifications: Abnormally Dry (D0), showing areas that may be going into or are coming out of drought, and four levels of drought (D1–D4).
The U.S. Drought Monitor is a joint effort of the National Drought Mitigation Center, U.S. Department of Agriculture, and National Oceanic and Atmospheric Administration.
This map shows precipitation for the past 30 days as a percentage of the historical average (1991–2020) for the same time period. Green/blue shades indicate above-normal precipitation, while brown shades indicate below-normal precipitation.
This map shows the average maximum daily temperature for the past 30 days compared to the historical average (1991–2020) for the same 30 days. Negative values (blue hues) indicate colder than normal temperatures, and positive values (red hues) indicate warmer than normal temperatures.
A drought index combines multiple drought indicators (e.g., precipitation, temperature, soil moisture) to depict drought conditions. For some products, like the U.S. Drought Monitor, authors combine their analysis of drought indicators with input from local observers. Other drought indices, like the Standardized Precipitation Index (SPI), use an objective calculation to describe the severity, location, timing, and/or duration of drought.
Learn MorePeriods of drought can lead to inadequate water supply, threatening the health, safety, and welfare of communities. Streamflow, groundwater, reservoir, and snowpack data are key to monitoring and forecasting water supply.
Learn MoreDrought can reduce the water availability and water quality necessary for productive farms, ranches, and grazing lands, resulting in significant negative direct and indirect economic impacts to the agricultural sector. Monitoring agricultural drought typically focuses on examining levels of precipitation, evaporative demand, soil moisture, and surface/groundwater quantity and quality.
Learn MoreDrought is defined as the lack of precipitation over an extended period of time, usually for a season or more, that results in a water shortage. Changes in precipitation can substantially disrupt crops and livestock, influence the frequency and intensity of severe weather events, and affect the quality and quantity of water available for municipal and industrial use.
Learn MorePeriods of drought can lead to inadequate water supply, threatening the health, safety, and welfare of communities. Streamflow, groundwater, reservoir, and snowpack data are key to monitoring and forecasting water supply.
Learn MoreDrought can reduce the water availability and water quality necessary for productive farms, ranches, and grazing lands, resulting in significant negative direct and indirect economic impacts to the agricultural sector. Monitoring agricultural drought typically focuses on examining levels of precipitation, evaporative demand, soil moisture, and surface/groundwater quantity and quality.
Learn MoreAir temperature can have wide-ranging effects on natural processes. Warmer air temperatures increase evapotranspiration—which is the combination of evaporation from the soil and bodies of water and transpiration from plants—and lower soil moisture.
Learn MoreDrought can reduce the water availability and water quality necessary for productive farms, ranches, and grazing lands, resulting in significant negative direct and indirect economic impacts to the agricultural sector. Monitoring agricultural drought typically focuses on examining levels of precipitation, evaporative demand, soil moisture, and surface/groundwater quantity and quality.
Learn MoreDrought & Dryness Categories
% of Nassau CountyAbnormally Dry
Abnormally Dry (D0) indicates a region that is going into or coming out of drought. View typical impacts by state.
Moderate Drought
Moderate Drought (D1) is the first of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
Severe Drought
Severe Drought (D2) is the second of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
Extreme Drought
Extreme Drought (D3) is the third of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
Exceptional Drought
Exceptional Drought (D4) is the most intense drought category, according to the U.S. Drought Monitor. View typical impacts by state.
Total Area in Drought (D1–D4)
Percentage of this county that is currently in drought (D1–D4), according to the U.S. Drought Monitor.
Percent of Normal Precipitation (%)
<25% of Normal
Precipitation was only 0% to 25% of the historical average for this location, compared to the same date range from 1991–2020.
25%–50% of Normal
Precipitation was 25% to 50% of the historical average for this location, compared to the same date range from 1991–2020.
50%–75% of Normal
Precipitation was 50% to 75% of the historical average for this location, compared to the same date range from 1991–2020.
75%–100% of Normal
Precipitation was 75% to 100% of the historical average for this location, compared to the same date range from 1991–2020.
100%–150% of Normal
Precipitation was 100% to 150% of the historical average for this location, compared to the same date range from 1991–2020.
150%–200% of Normal
Precipitation was 150% to 200% of the historical average for this location, compared to the same date range from 1991–2020.
200%–300% of Normal
Precipitation was 200% to 300% of the historical average for this location, compared to the same date range from 1991–2020.
>300% of Normal
Precipitation was greater than 300% of the historical average for this location, compared to the same date range from 1991–2020.
Departure from Normal Max Temperature (°F)
>8°F Below Normal
The average maximum temperature was more than 8°F colder than normal for this location.
6–8°F Below Normal
The average maximum temperature was 6–8°F colder than normal for this location.
4–6°F Below Normal
The average maximum temperature was 4–6°F colder than normal for this location.
3–4°F Below Normal
The average maximum temperature was 3–4°F colder than normal for this location.
1–3°F Below Normal
The average maximum temperature was 1–3°F colder than normal for this location.
0–1°F Below Normal
The average maximum temperature was 0–1°F colder than normal for this location.
0–1°F Above Normal
The average maximum temperature was 0–1°F warmer than normal for this location.
1–3°F Above Normal
The average maximum temperature was 1–3°F warmer than normal for this location.
3–4°F Above Normal
The average maximum temperature was 3–4°F warmer than normal for this location.
4–6°F Above Normal
The average maximum temperature was 4–6°F warmer than normal for this location.
6–8°F Above Normal
The average maximum temperature was 6–8°F warmer than normal for this location.
>8°F Above Normal
The average maximum temperature was more than 8°F warmer than normal for this location.
The U.S. Drought Monitor depicts the location and intensity of drought across the country using 5 classifications: Abnormally Dry (D0), showing areas that may be going into or are coming out of drought, and four levels of drought (D1–D4).
The U.S. Drought Monitor is a joint effort of the National Drought Mitigation Center, U.S. Department of Agriculture, and National Oceanic and Atmospheric Administration.
This map shows precipitation for the past 30 days as a percentage of the historical average (1991–2020) for the same time period. Green/blue shades indicate above-normal precipitation, while brown shades indicate below-normal precipitation.
This map shows the average maximum daily temperature for the past 30 days compared to the historical average (1991–2020) for the same 30 days. Negative values (blue hues) indicate colder than normal temperatures, and positive values (red hues) indicate warmer than normal temperatures.
The U.S. Drought Monitor map is released every Thursday morning, with data valid through Tuesday at 7 am Eastern.
Precipitation data are updated daily, with a delay of 3 to 4 days to allow for data collection and quality control.
Temperature data are updated daily, with a delay of 3 to 4 days to allow for data collection and quality control.
A drought index combines multiple drought indicators (e.g., precipitation, temperature, soil moisture) to depict drought conditions. For some products, like the U.S. Drought Monitor, authors combine their analysis of drought indicators with input from local observers. Other drought indices, like the Standardized Precipitation Index (SPI), use an objective calculation to describe the severity, location, timing, and/or duration of drought.
Learn MorePeriods of drought can lead to inadequate water supply, threatening the health, safety, and welfare of communities. Streamflow, groundwater, reservoir, and snowpack data are key to monitoring and forecasting water supply.
Learn MoreDrought can reduce the water availability and water quality necessary for productive farms, ranches, and grazing lands, resulting in significant negative direct and indirect economic impacts to the agricultural sector. Monitoring agricultural drought typically focuses on examining levels of precipitation, evaporative demand, soil moisture, and surface/groundwater quantity and quality.
Learn MoreDrought is defined as the lack of precipitation over an extended period of time, usually for a season or more, that results in a water shortage. Changes in precipitation can substantially disrupt crops and livestock, influence the frequency and intensity of severe weather events, and affect the quality and quantity of water available for municipal and industrial use.
Learn MorePeriods of drought can lead to inadequate water supply, threatening the health, safety, and welfare of communities. Streamflow, groundwater, reservoir, and snowpack data are key to monitoring and forecasting water supply.
Learn MoreDrought can reduce the water availability and water quality necessary for productive farms, ranches, and grazing lands, resulting in significant negative direct and indirect economic impacts to the agricultural sector. Monitoring agricultural drought typically focuses on examining levels of precipitation, evaporative demand, soil moisture, and surface/groundwater quantity and quality.
Learn MoreAir temperature can have wide-ranging effects on natural processes. Warmer air temperatures increase evapotranspiration—which is the combination of evaporation from the soil and bodies of water and transpiration from plants—and lower soil moisture.
Learn MoreDrought can reduce the water availability and water quality necessary for productive farms, ranches, and grazing lands, resulting in significant negative direct and indirect economic impacts to the agricultural sector. Monitoring agricultural drought typically focuses on examining levels of precipitation, evaporative demand, soil moisture, and surface/groundwater quantity and quality.
Learn MorePrecipitation Conditions
Inches of Precipitation
This location received less than 0.01 inch of precipitation during this 7-day period.
This location received 0.01–0.5 inch of precipitation during this 7-day period.
This location received 0.5–1 inch of precipitation during this 7-day period.
This location received 1–2 inches of precipitation during this 7-day period.
This location received 2–4 inches of precipitation during this 7-day period.
This location received 4–6 inches of precipitation during this 7-day period.
This location received 6–8 inches of precipitation during this 7-day period.
This location received more than 8 inches of precipitation during this 7-day period.
Percent of Normal Precipitation (%)
<25% of Normal
Precipitation was only 0% to 25% of the historical average for this location, compared to the same date range from 1991–2020.
25%–50% of Normal
Precipitation was 25% to 50% of the historical average for this location, compared to the same date range from 1991–2020.
50%–75% of Normal
Precipitation was 50% to 75% of the historical average for this location, compared to the same date range from 1991–2020.
75%–100% of Normal
Precipitation was 75% to 100% of the historical average for this location, compared to the same date range from 1991–2020.
100%–150% of Normal
Precipitation was 100% to 150% of the historical average for this location, compared to the same date range from 1991–2020.
150%–200% of Normal
Precipitation was 150% to 200% of the historical average for this location, compared to the same date range from 1991–2020.
200%–300% of Normal
Precipitation was 200% to 300% of the historical average for this location, compared to the same date range from 1991–2020.
>300% of Normal
Precipitation was greater than 300% of the historical average for this location, compared to the same date range from 1991–2020.
Percent of Normal Precipitation (%)
<25% of Normal
Precipitation was only 0% to 25% of the historical average for this location, compared to the same date range from 1991–2020.
25%–50% of Normal
Precipitation was 25% to 50% of the historical average for this location, compared to the same date range from 1991–2020.
50%–75% of Normal
Precipitation was 50% to 75% of the historical average for this location, compared to the same date range from 1991–2020.
75%–100% of Normal
Precipitation was 75% to 100% of the historical average for this location, compared to the same date range from 1991–2020.
100%–150% of Normal
Precipitation was 100% to 150% of the historical average for this location, compared to the same date range from 1991–2020.
150%–200% of Normal
Precipitation was 150% to 200% of the historical average for this location, compared to the same date range from 1991–2020.
200%–300% of Normal
Precipitation was 200% to 300% of the historical average for this location, compared to the same date range from 1991–2020.
>300% of Normal
Precipitation was greater than 300% of the historical average for this location, compared to the same date range from 1991–2020.
This map shows total precipitation (in inches) for the past 7 days. Dark blue shades indicate the highest precipitation amounts.
This map shows precipitation for the past 30 days as a percentage of the historical average (1991–2020) for the same time period. Green/blue shades indicate above-normal precipitation, while brown shades indicate below-normal precipitation.
This map shows precipitation for the past 60 days as a percentage of the historical average (1991–2020) for the same time period. Green/blue shades indicate above-normal precipitation, while brown shades indicate below-normal precipitation.
Precipitation data are updated daily, with a delay of 3 to 4 days to allow for data collection and quality control.
Precipitation data are updated daily, with a delay of 3 to 4 days to allow for data collection and quality control.
Precipitation data are updated daily, with a delay of 3 to 4 days to allow for data collection and quality control.
Drought is defined as the lack of precipitation over an extended period of time, usually for a season or more, that results in a water shortage. Changes in precipitation can substantially disrupt crops and livestock, influence the frequency and intensity of severe weather events, and affect the quality and quantity of water available for municipal and industrial use.
Learn MorePeriods of drought can lead to inadequate water supply, threatening the health, safety, and welfare of communities. Streamflow, groundwater, reservoir, and snowpack data are key to monitoring and forecasting water supply.
Learn MoreDrought can reduce the water availability and water quality necessary for productive farms, ranches, and grazing lands, resulting in significant negative direct and indirect economic impacts to the agricultural sector. Monitoring agricultural drought typically focuses on examining levels of precipitation, evaporative demand, soil moisture, and surface/groundwater quantity and quality.
Learn MoreDrought is defined as the lack of precipitation over an extended period of time, usually for a season or more, that results in a water shortage. Changes in precipitation can substantially disrupt crops and livestock, influence the frequency and intensity of severe weather events, and affect the quality and quantity of water available for municipal and industrial use.
Learn MorePeriods of drought can lead to inadequate water supply, threatening the health, safety, and welfare of communities. Streamflow, groundwater, reservoir, and snowpack data are key to monitoring and forecasting water supply.
Learn MoreDrought can reduce the water availability and water quality necessary for productive farms, ranches, and grazing lands, resulting in significant negative direct and indirect economic impacts to the agricultural sector. Monitoring agricultural drought typically focuses on examining levels of precipitation, evaporative demand, soil moisture, and surface/groundwater quantity and quality.
Learn MoreDrought is defined as the lack of precipitation over an extended period of time, usually for a season or more, that results in a water shortage. Changes in precipitation can substantially disrupt crops and livestock, influence the frequency and intensity of severe weather events, and affect the quality and quantity of water available for municipal and industrial use.
Learn MorePeriods of drought can lead to inadequate water supply, threatening the health, safety, and welfare of communities. Streamflow, groundwater, reservoir, and snowpack data are key to monitoring and forecasting water supply.
Learn MoreDrought can reduce the water availability and water quality necessary for productive farms, ranches, and grazing lands, resulting in significant negative direct and indirect economic impacts to the agricultural sector. Monitoring agricultural drought typically focuses on examining levels of precipitation, evaporative demand, soil moisture, and surface/groundwater quantity and quality.
Learn MoreTemperature Conditions
Maximum Temperature (°F)
<0°F
The 7-day average daily maximum temperature is below 0°F.
0–10°F
The 7-day average daily maximum temperature is between 0–10°F.
10–20°F
The 7-day average daily maximum temperature is between 10–20°F.
20–30°F
The 7-day average daily maximum temperature is between 20–30°F.
30–40°F
The 7-day average daily maximum temperature is between 30–40°F.
40–60°F
The 7-day average daily maximum temperature is between 40–60°F.
60–70°F
The 7-day average daily maximum temperature is between 60–70°F.
70–80°F
The 7-day average daily maximum temperature is between 70–80°F.
80–90°F
The 7-day average daily maximum temperature is between 80–90°F.
90–100°F
The 7-day average daily maximum temperature is between 90–100°F.
>100°F
The 7-day average daily maximum temperature is between greater than 100°F.
Departure from Normal Max Temperature (°F)
>8°F Below Normal
The average maximum temperature was more than 8°F colder than normal for this location.
6–8°F Below Normal
The average maximum temperature was 6–8°F colder than normal for this location.
4–6°F Below Normal
The average maximum temperature was 4–6°F colder than normal for this location.
3–4°F Below Normal
The average maximum temperature was 3–4°F colder than normal for this location.
1–3°F Below Normal
The average maximum temperature was 1–3°F colder than normal for this location.
0–1°F Below Normal
The average maximum temperature was 0–1°F colder than normal for this location.
0–1°F Above Normal
The average maximum temperature was 0–1°F warmer than normal for this location.
1–3°F Above Normal
The average maximum temperature was 1–3°F warmer than normal for this location.
3–4°F Above Normal
The average maximum temperature was 3–4°F warmer than normal for this location.
4–6°F Above Normal
The average maximum temperature was 4–6°F warmer than normal for this location.
6–8°F Above Normal
The average maximum temperature was 6–8°F warmer than normal for this location.
>8°F Above Normal
The average maximum temperature was more than 8°F warmer than normal for this location.
Departure from Normal Max Temperature (°F)
>8°F Below Normal
The average maximum temperature was more than 8°F colder than normal for this location.
6–8°F Below Normal
The average maximum temperature was 6–8°F colder than normal for this location.
4–6°F Below Normal
The average maximum temperature was 4–6°F colder than normal for this location.
3–4°F Below Normal
The average maximum temperature was 3–4°F colder than normal for this location.
1–3°F Below Normal
The average maximum temperature was 1–3°F colder than normal for this location.
0–1°F Below Normal
The average maximum temperature was 0–1°F colder than normal for this location.
0–1°F Above Normal
The average maximum temperature was 0–1°F warmer than normal for this location.
1–3°F Above Normal
The average maximum temperature was 1–3°F warmer than normal for this location.
3–4°F Above Normal
The average maximum temperature was 3–4°F warmer than normal for this location.
4–6°F Above Normal
The average maximum temperature was 4–6°F warmer than normal for this location.
6–8°F Above Normal
The average maximum temperature was 6–8°F warmer than normal for this location.
>8°F Above Normal
The average maximum temperature was more than 8°F warmer than normal for this location.
This map shows the average maximum daily temperature (°F) for the last 7 days. Blue hues indicate cooler temperatures, while red hues indicate warmer temperatures.
This map shows the average maximum daily temperature for the past 7 days compared to the historical average (1991–2020) for the same 7 days. Negative values (blue hues) indicate colder than normal temperatures, and positive values (red hues) indicate warmer than normal temperatures.
This map shows the average maximum daily temperature for the past 30 days compared to the historical average (1991–2020) for the same 30 days. Negative values (blue hues) indicate colder than normal temperatures, and positive values (red hues) indicate warmer than normal temperatures.
Temperature data are updated daily, with a delay of 3 to 4 days to allow for data collection and quality control.
Temperature data are updated daily, with a delay of 3 to 4 days to allow for data collection and quality control.
Temperature data are updated daily, with a delay of 3 to 4 days to allow for data collection and quality control.
Air temperature can have wide-ranging effects on natural processes. Warmer air temperatures increase evapotranspiration—which is the combination of evaporation from the soil and bodies of water and transpiration from plants—and lower soil moisture.
Learn MoreDrought can reduce the water availability and water quality necessary for productive farms, ranches, and grazing lands, resulting in significant negative direct and indirect economic impacts to the agricultural sector. Monitoring agricultural drought typically focuses on examining levels of precipitation, evaporative demand, soil moisture, and surface/groundwater quantity and quality.
Learn MoreAir temperature can have wide-ranging effects on natural processes. Warmer air temperatures increase evapotranspiration—which is the combination of evaporation from the soil and bodies of water and transpiration from plants—and lower soil moisture.
Learn MoreDrought can reduce the water availability and water quality necessary for productive farms, ranches, and grazing lands, resulting in significant negative direct and indirect economic impacts to the agricultural sector. Monitoring agricultural drought typically focuses on examining levels of precipitation, evaporative demand, soil moisture, and surface/groundwater quantity and quality.
Learn MoreAir temperature can have wide-ranging effects on natural processes. Warmer air temperatures increase evapotranspiration—which is the combination of evaporation from the soil and bodies of water and transpiration from plants—and lower soil moisture.
Learn MoreDrought can reduce the water availability and water quality necessary for productive farms, ranches, and grazing lands, resulting in significant negative direct and indirect economic impacts to the agricultural sector. Monitoring agricultural drought typically focuses on examining levels of precipitation, evaporative demand, soil moisture, and surface/groundwater quantity and quality.
Learn MoreThe U.S. Geological Survey (USGS) produces maps of real-time streamflow conditions compared to historical conditions. The map depicts streamflow conditions as computed at USGS streamgages. The colors represent real-time streamflow compared to percentiles of historical daily streamflow for the day of the year. Click on a streamgage to view more data for that location.
This map shows streamflow conditions averaged over the last 28 days, compared to historical conditions for the same time period. Click on a streamgage to view current data from the U.S. Geological Survey.
This map shows the probability (percent chance) of above-normal, near-normal, or below-normal precipitation over the next calendar month.
Periods of drought can lead to inadequate water supply, threatening the health, safety, and welfare of communities. Streamflow, groundwater, reservoir, and snowpack data are key to monitoring and forecasting water supply.
Learn MoreDrought can alter the ecological balance of natural systems and harm fish, wildlife, and plant species, as well as the benefits that these ecosystems provide to human communities. The environmental consequences of drought include losses in plant growth; increases in fire and insect outbreaks; altered rates of carbon, nutrient, and water cycling; and local species extinctions.
Learn MoreBecause energy and water are so interdependent, the availability and predictability of water resources can directly affect energy systems. Energy professionals need information on current drought conditions and outlooks in order to make informed decisions on cooling, alternative water supplies, pricing, and infrastructure security.
Learn MoreDuring drought conditions that result in low water levels on rivers and other waterways, port and maritime navigation and transportation operations may be limited due to a reduction in available routes and cargo-carrying capacity, resulting in increased costs. In addition, higher temperatures that often coexist with drought can impact roads, airport runways, and rail lines.
Learn MorePeriods of drought can lead to inadequate water supply, threatening the health, safety, and welfare of communities. Streamflow, groundwater, reservoir, and snowpack data are key to monitoring and forecasting water supply.
Learn MoreDrought can alter the ecological balance of natural systems and harm fish, wildlife, and plant species, as well as the benefits that these ecosystems provide to human communities. The environmental consequences of drought include losses in plant growth; increases in fire and insect outbreaks; altered rates of carbon, nutrient, and water cycling; and local species extinctions.
Learn MoreBecause energy and water are so interdependent, the availability and predictability of water resources can directly affect energy systems. Energy professionals need information on current drought conditions and outlooks in order to make informed decisions on cooling, alternative water supplies, pricing, and infrastructure security.
Learn MoreDuring drought conditions that result in low water levels on rivers and other waterways, port and maritime navigation and transportation operations may be limited due to a reduction in available routes and cargo-carrying capacity, resulting in increased costs. In addition, higher temperatures that often coexist with drought can impact roads, airport runways, and rail lines.
Learn MoreDrought is defined as the lack of precipitation over an extended period of time, usually for a season or more, that results in a water shortage. Changes in precipitation can substantially disrupt crops and livestock, influence the frequency and intensity of severe weather events, and affect the quality and quantity of water available for municipal and industrial use.
Learn MoreSnow drought is a period of abnormally low snowpack for the time of year. Snowpack typically acts as a natural reservoir, providing water throughout the drier summer months. Lack of snowpack storage, or a shift in timing of snowmelt, can be a challenge for drought planning.
Learn MorePeriods of drought can lead to inadequate water supply, threatening the health, safety, and welfare of communities. Streamflow, groundwater, reservoir, and snowpack data are key to monitoring and forecasting water supply.
Learn MoreDrought can reduce the water availability and water quality necessary for productive farms, ranches, and grazing lands, resulting in significant negative direct and indirect economic impacts to the agricultural sector. Monitoring agricultural drought typically focuses on examining levels of precipitation, evaporative demand, soil moisture, and surface/groundwater quantity and quality.
Learn MoreStreamflow Conditions
Record Low
Estimated streamflow is the lowest value recorded at this gauge on this day of the year. Learn more.
Much Below Normal (<10th Percentile)
Estimated streamflow is in the 0–10th percentile of historical streamflow values recorded at this gauge on this day of the year. Learn more.
Below Normal (10th–25th Percentile)
Estimated streamflow is in the 10th–25th percentile of historical streamflow values recorded at this gauge on this day of the year. Learn more.
Normal (25th–75th Percentile)
Estimated streamflow is in the 25th–75th percentile of historical streamflow values recorded at this gauge on this day of the year. Learn more.
Above Normal (75th–90th Percentile)
Estimated streamflow is in the 75th–90th percentile of historical streamflow values recorded at this gauge on this day of the year. Learn more.
Much Above Normal (>90th Percentile)
Estimated streamflow is in the 90th–100th percentile of historical streamflow values recorded at this gauge on this day of the year. Learn more.
Record High
Estimated streamflow is the highest value ever measured at this gauge on this day of the year. Learn more.
Not Ranked
A flow category has not been computed for this gauge, for example due to insufficient historical data or no current streamflow estimates.
Streamflow Conditions
Record Low
Estimated streamflow is the lowest value recorded at this gauge on this day of the year. Learn more.
Much Below Normal (<10th Percentile)
Estimated streamflow is in the 0–10th percentile of historical streamflow values recorded at this gauge on this day of the year. Learn more.
Below Normal (10th–25th Percentile)
Estimated streamflow is in the 10th–25th percentile of historical streamflow values recorded at this gauge on this day of the year. Learn more.
Normal (25th–75th Percentile)
Estimated streamflow is in the 25th–75th percentile of historical streamflow values recorded at this gauge on this day of the year. Learn more.
Above Normal (75th–90th Percentile)
Estimated streamflow is in the 75th–90th percentile of historical streamflow values recorded at this gauge on this day of the year. Learn more.
Much Above Normal (>90th Percentile)
Estimated streamflow is in the 90th–100th percentile of historical streamflow values recorded at this gauge on this day of the year. Learn more.
Record High
Estimated streamflow is the highest value ever measured at this gauge on this day of the year. Learn more.
Not Ranked
A flow category has not been computed for this gauge, for example due to insufficient historical data or no current streamflow estimates.
Probability of Below-Normal Precipitation
33%–40% Chance of Below Normal
There is an 33%–40% chance of below-normal precipitation during this period.
40%–50% Chance of Below Normal
There is an 40%–50% chance of below-normal precipitation during this period.
50%–60% Chance of Below Normal
There is an 50%–60% chance of below-normal precipitation during this period.
60%–70% Chance of Below Normal
There is an 60%–70% chance of below-normal precipitation during this period.
70%–80% Chance of Below Normal
There is an 70%–80% chance of below-normal precipitation during this period.
80%–90% Chance of Below Normal
There is an 80%–90% chance of below-normal precipitation during this period.
>90% Chance of Below Normal
There is a >90% chance of below-normal precipitation during this period.
Probability of Above-Normal Precipitation
33%–40% Chance of Above Normal
There is an 33%–40% chance of above-normal precipitation during this period.
40%–50% Chance of Above Normal
There is an 40%–50% chance of above-normal precipitation during this period.
50%–60% Chance of Above Normal
There is an 50%–60% chance of above-normal precipitation during this period.
60%–70% Chance of Above Normal
There is an 60%–70% chance of above-normal precipitation during this period.
70%–80% Chance of Above Normal
There is an 70%–80% chance of above-normal precipitation during this period.
80%–90% Chance of Above Normal
There is an 80%–90% chance of above-normal precipitation during this period.
>90% Chance of Above Normal
There is a >90% chance of above-normal precipitation during this period.
Probability of Near-Normal Precipitation
33%–40% of Near Normal
There is an 33%–40% chance of near-normal precipitation during this period.
40%–50% of Near Normal
There is an 40%–50% chance of near-normal precipitation during this period.
The U.S. Geological Survey (USGS) produces maps of real-time streamflow conditions compared to historical conditions. The map depicts streamflow conditions as computed at USGS streamgages. The colors represent real-time streamflow compared to percentiles of historical daily streamflow for the day of the year. Click on a streamgage to view more data for that location.
This map shows streamflow conditions averaged over the last 28 days, compared to historical conditions for the same time period. Click on a streamgage to view current data from the U.S. Geological Survey.
This map shows the probability (percent chance) of above-normal, near-normal, or below-normal precipitation over the next calendar month.
This map updates daily on Drought.gov. View the most recent real-time streamflow data via USGS.
This map updates daily on Drought.gov. View the most recent real-time streamflow data via USGS.
The Climate Prediction Center updates its monthly precipitation outlook on the last day of every calendar month.
Periods of drought can lead to inadequate water supply, threatening the health, safety, and welfare of communities. Streamflow, groundwater, reservoir, and snowpack data are key to monitoring and forecasting water supply.
Learn MoreDrought can alter the ecological balance of natural systems and harm fish, wildlife, and plant species, as well as the benefits that these ecosystems provide to human communities. The environmental consequences of drought include losses in plant growth; increases in fire and insect outbreaks; altered rates of carbon, nutrient, and water cycling; and local species extinctions.
Learn MoreBecause energy and water are so interdependent, the availability and predictability of water resources can directly affect energy systems. Energy professionals need information on current drought conditions and outlooks in order to make informed decisions on cooling, alternative water supplies, pricing, and infrastructure security.
Learn MoreDuring drought conditions that result in low water levels on rivers and other waterways, port and maritime navigation and transportation operations may be limited due to a reduction in available routes and cargo-carrying capacity, resulting in increased costs. In addition, higher temperatures that often coexist with drought can impact roads, airport runways, and rail lines.
Learn MorePeriods of drought can lead to inadequate water supply, threatening the health, safety, and welfare of communities. Streamflow, groundwater, reservoir, and snowpack data are key to monitoring and forecasting water supply.
Learn MoreDrought can alter the ecological balance of natural systems and harm fish, wildlife, and plant species, as well as the benefits that these ecosystems provide to human communities. The environmental consequences of drought include losses in plant growth; increases in fire and insect outbreaks; altered rates of carbon, nutrient, and water cycling; and local species extinctions.
Learn MoreBecause energy and water are so interdependent, the availability and predictability of water resources can directly affect energy systems. Energy professionals need information on current drought conditions and outlooks in order to make informed decisions on cooling, alternative water supplies, pricing, and infrastructure security.
Learn MoreDuring drought conditions that result in low water levels on rivers and other waterways, port and maritime navigation and transportation operations may be limited due to a reduction in available routes and cargo-carrying capacity, resulting in increased costs. In addition, higher temperatures that often coexist with drought can impact roads, airport runways, and rail lines.
Learn MoreDrought is defined as the lack of precipitation over an extended period of time, usually for a season or more, that results in a water shortage. Changes in precipitation can substantially disrupt crops and livestock, influence the frequency and intensity of severe weather events, and affect the quality and quantity of water available for municipal and industrial use.
Learn MoreSnow drought is a period of abnormally low snowpack for the time of year. Snowpack typically acts as a natural reservoir, providing water throughout the drier summer months. Lack of snowpack storage, or a shift in timing of snowmelt, can be a challenge for drought planning.
Learn MorePeriods of drought can lead to inadequate water supply, threatening the health, safety, and welfare of communities. Streamflow, groundwater, reservoir, and snowpack data are key to monitoring and forecasting water supply.
Learn MoreDrought can reduce the water availability and water quality necessary for productive farms, ranches, and grazing lands, resulting in significant negative direct and indirect economic impacts to the agricultural sector. Monitoring agricultural drought typically focuses on examining levels of precipitation, evaporative demand, soil moisture, and surface/groundwater quantity and quality.
Learn MoreThe U.S. Air Quality Index (AQI) is designed to communicate whether air quality is healthy or unhealthy. This map displays the AQI at sensors across the U.S. alongside the current U.S. Drought Monitor, as of 10 a.m. Eastern.
Drought can cause significant human health outcomes that can challenge public health departments, emergency managers, and healthcare providers. Drought can lead to decreased water quantity and quality, increased incidence of illness or disease, increased mortality rates, and adverse mental health outcomes as livelihoods are challenged.
Learn MoreDuring drought conditions, fuels for wildfire, such as grasses and trees, can dry out and become more flammable. Drought can also increase the probability of ignition and the rate at which fire spreads. Temperature, soil moisture, humidity, wind speed, and fuel availability (vegetation) are all factors that interact to influence the frequency of large wildfires.
Learn MoreAir Quality
AQI 0 to 50: Good
Air quality is satisfactory, and air pollution poses little or no risk. Learn more.
AQI 51 to 100: Moderate
Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Learn more.
AQI 101 to 150: Unhealthy for Sensitive Groups
Members of sensitive groups may experience health effects. The general public is less likely to be affected. Learn more.
AQI 151 to 200: Unhealthy
Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Learn more.
AQI 201 to 300: Very Unhealthy
Health alert: The risk of health effects is increased for everyone. Learn more.
AQI >301: Hazardous
Health warning of emergency conditions: everyone is more likely to be affected. Learn more.
U.S. Drought Monitor
D0 - Abnormally Dry
Abnormally Dry (D0) indicates a region that is going into or coming out of drought, according to the U.S. Drought Monitor. View typical impacts by state.
D1 – Moderate Drought
Moderate Drought (D1) is the first of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D2 – Severe Drought
Severe Drought (D2) is the second of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D3 – Extreme Drought
Extreme Drought (D3) is the third of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D4 – Exceptional Drought
Exceptional Drought (D4) is the most intense drought category, according to the U.S. Drought Monitor. View typical impacts by state.
The U.S. Air Quality Index (AQI) is designed to communicate whether air quality is healthy or unhealthy. This map displays the AQI at sensors across the U.S. alongside the current U.S. Drought Monitor, as of 10 a.m. Eastern.
On Drought.gov, Air Quality Index maps are updated daily at 10 a.m. Eastern. View hourly air quality information from AirNow.
Drought can cause significant human health outcomes that can challenge public health departments, emergency managers, and healthcare providers. Drought can lead to decreased water quantity and quality, increased incidence of illness or disease, increased mortality rates, and adverse mental health outcomes as livelihoods are challenged.
Learn MoreDuring drought conditions, fuels for wildfire, such as grasses and trees, can dry out and become more flammable. Drought can also increase the probability of ignition and the rate at which fire spreads. Temperature, soil moisture, humidity, wind speed, and fuel availability (vegetation) are all factors that interact to influence the frequency of large wildfires.
Learn MoreQuantitative Precipitation Forecast
Predicted Inches of Precipitation
Less than 0.01 inch
0.01 to 0.1 inch
0.1 to 0.25 inch
0.25 to 0.5 inch
0.5 to 0.75 inch
0.75 to 1 inch
1 to 1.25 inches
1.25 to 1.5 inches
1.5 to 1.75 inches
1.75 to 2 inches
1.5 to 2 inches
2 to 2.5 inches
2.5 to 3 inches
3 to 4 inches
4 to 5 inches
5 to 7 inches
7 to 10 inches
10 to 15 inches
15 to 20 inches
More than 20 inches
Predicted Inches of Precipitation
Less than 0.01 inch
0.01 to 0.1 inch
0.1 to 0.25 inch
0.25 to 0.5 inch
0.5 to 0.75 inch
0.75 to 1 inch
1 to 1.25 inches
1.25 to 1.5 inches
1.5 to 1.75 inches
1.75 to 2 inches
1.5 to 2 inches
2 to 2.5 inches
2.5 to 3 inches
3 to 4 inches
4 to 5 inches
5 to 7 inches
7 to 10 inches
10 to 15 inches
15 to 20 inches
More than 20 inches
This map shows the amount of liquid precipitation (in inches) expected to fall over the next 1 day, according to the National Weather Service.
This map shows the amount of liquid precipitation (in inches) expected to fall over the next 7 days, according to the National Weather Service.
The Quantitative Precipitation Forecast maps on Drought.gov are updated once a day and are valid from 7 a.m. Eastern that day.
The Quantitative Precipitation Forecast maps on Drought.gov are updated once a day and are valid from 7 a.m. Eastern that day.
Drought is defined as the lack of precipitation over an extended period of time, usually for a season or more, that results in a water shortage. Changes in precipitation can substantially disrupt crops and livestock, influence the frequency and intensity of severe weather events, and affect the quality and quantity of water available for municipal and industrial use.
Learn MoreFlash drought is the rapid onset or intensification of drought. Unlike slow-evolving drought, which is caused by a decline in precipitation, flash drought occurs when low precipitation is accompanied by abnormally high temperatures, high winds, and/or changes in radiation. These sometimes-rapid changes can quickly raise evapotranspiration rates and remove available water from the landscape.
Learn MoreDrought can reduce the water availability and water quality necessary for productive farms, ranches, and grazing lands, resulting in significant negative direct and indirect economic impacts to the agricultural sector. Monitoring agricultural drought typically focuses on examining levels of precipitation, evaporative demand, soil moisture, and surface/groundwater quantity and quality.
Learn MoreDrought is defined as the lack of precipitation over an extended period of time, usually for a season or more, that results in a water shortage. Changes in precipitation can substantially disrupt crops and livestock, influence the frequency and intensity of severe weather events, and affect the quality and quantity of water available for municipal and industrial use.
Learn MoreFlash drought is the rapid onset or intensification of drought. Unlike slow-evolving drought, which is caused by a decline in precipitation, flash drought occurs when low precipitation is accompanied by abnormally high temperatures, high winds, and/or changes in radiation. These sometimes-rapid changes can quickly raise evapotranspiration rates and remove available water from the landscape.
Learn MoreDrought can reduce the water availability and water quality necessary for productive farms, ranches, and grazing lands, resulting in significant negative direct and indirect economic impacts to the agricultural sector. Monitoring agricultural drought typically focuses on examining levels of precipitation, evaporative demand, soil moisture, and surface/groundwater quantity and quality.
Learn MoreU.S. Drought Outlooks
Drought Is Predicted To...
Drought Persists
During this time period, NOAA's Climate Prediction Center predicts that drought conditions will persist.
Drought Improves
During this time period, NOAA's Climate Prediction Center predicts that existing drought conditions will improve (but not be removed).
Drought Is Removed
During this time period, NOAA's Climate Prediction Center predicts that drought will be removed.
Drought Develops
During this time period, NOAA's Climate Prediction Center predicts that drought will develop.
No Drought Present
According to NOAA's Climate Prediction Center, there is no drought, and is drought development is not predicted.
Drought Is Predicted To...
Drought Persists
During this time period, NOAA's Climate Prediction Center predicts that drought conditions will persist.
Drought Improves
During this time period, NOAA's Climate Prediction Center predicts that existing drought conditions will improve (but not be removed).
Drought Is Removed
During this time period, NOAA's Climate Prediction Center predicts that drought will be removed.
Drought Develops
During this time period, NOAA's Climate Prediction Center predicts that drought will develop.
No Drought Present
According to NOAA's Climate Prediction Center, there is no drought, and is drought development is not predicted.
The Monthly Drought Outlook predicts whether drought will develop, remain, improve, or be removed in the next calendar month.
The Seasonal Drought Outlook predicts whether drought will develop, remain, improve, or be removed in the next 3 months or so.
The Climate Prediction Center issues its Monthly Drought Outlooks on the last day of the calendar month.
The Climate Prediction Center issues its Seasonal Drought Outlooks on the third Thursday of each calendar month. Sometimes, the map is adjusted on the last day of the month to maintain consistency with the Monthly Drought Outlook.
Snow drought is a period of abnormally low snowpack for the time of year. Snowpack typically acts as a natural reservoir, providing water throughout the drier summer months. Lack of snowpack storage, or a shift in timing of snowmelt, can be a challenge for drought planning.
Learn MorePeriods of drought can lead to inadequate water supply, threatening the health, safety, and welfare of communities. Streamflow, groundwater, reservoir, and snowpack data are key to monitoring and forecasting water supply.
Learn MoreDrought can reduce the water availability and water quality necessary for productive farms, ranches, and grazing lands, resulting in significant negative direct and indirect economic impacts to the agricultural sector. Monitoring agricultural drought typically focuses on examining levels of precipitation, evaporative demand, soil moisture, and surface/groundwater quantity and quality.
Learn MoreDuring drought conditions, fuels for wildfire, such as grasses and trees, can dry out and become more flammable. Drought can also increase the probability of ignition and the rate at which fire spreads. Temperature, soil moisture, humidity, wind speed, and fuel availability (vegetation) are all factors that interact to influence the frequency of large wildfires.
Learn MoreSnow drought is a period of abnormally low snowpack for the time of year. Snowpack typically acts as a natural reservoir, providing water throughout the drier summer months. Lack of snowpack storage, or a shift in timing of snowmelt, can be a challenge for drought planning.
Learn MorePeriods of drought can lead to inadequate water supply, threatening the health, safety, and welfare of communities. Streamflow, groundwater, reservoir, and snowpack data are key to monitoring and forecasting water supply.
Learn MoreDrought can reduce the water availability and water quality necessary for productive farms, ranches, and grazing lands, resulting in significant negative direct and indirect economic impacts to the agricultural sector. Monitoring agricultural drought typically focuses on examining levels of precipitation, evaporative demand, soil moisture, and surface/groundwater quantity and quality.
Learn MoreDuring drought conditions, fuels for wildfire, such as grasses and trees, can dry out and become more flammable. Drought can also increase the probability of ignition and the rate at which fire spreads. Temperature, soil moisture, humidity, wind speed, and fuel availability (vegetation) are all factors that interact to influence the frequency of large wildfires.
Learn MoreHistorical Conditions for Nassau County
U.S. Drought Monitor
D0 - Abnormally Dry
Abnormally Dry (D0) indicates a region that is going into or coming out of drought, according to the U.S. Drought Monitor. View typical impacts by state.
D1 – Moderate Drought
Moderate Drought (D1) is the first of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D2 – Severe Drought
Severe Drought (D2) is the second of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D3 – Extreme Drought
Extreme Drought (D3) is the third of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D4 – Exceptional Drought
Exceptional Drought (D4) is the most intense drought category, according to the U.S. Drought Monitor. View typical impacts by state.
The U.S. Drought Monitor (2000–present) depicts the location and intensity of drought across the country. Every Thursday, authors from NOAA, USDA, and the National Drought Mitigation Center produce a new map based on their assessments of the best available data and input from local observers. The map uses five categories: Abnormally Dry (D0), showing areas that may be going into or are coming out of drought, and four levels of drought (D1–D4). Learn more.
Dry Conditions
D4 (SPI of -2.0 or less)
The 9-month Standardized Precipitation Index (SPI) value for this location is -2.0 or less, indicating exceptional drought (D4) conditions.
D3 (SPI of -1.9 to -1.6)
The Standardized Precipitation Index (SPI) value for this location is between -1.9 to -1.6, indicating extreme drought (D3) conditions.
D2 (SPI of -1.5 to -1.3)
The Standardized Precipitation Index (SPI) value for this location is between -1.5 to -1.3, indicating severe drought (D2) conditions.
D1 (SPI of -1.2 to -0.8)
The Standardized Precipitation Index (SPI) value for this location is between -1.2 to -0.8, indicating moderate drought (D1) conditions.
D0 (SPI of -0.7 to -0.5)
The Standardized Precipitation Index (SPI) value for this location is between -0.7 to -0.5, indicating abnormally dry (D0) conditions.
Wet Conditions
W0 (SPI of 0.5 to 0.7)
The Standardized Precipitation Index (SPI) value for this location is between 0.5 to 0.7, indicating abnormally wet (W0) conditions.
W1 (SPI of 0.8 to 1.2)
The Standardized Precipitation Index (SPI) value for this location is between 0.8 to 1.2, indicating moderate wet (W1) conditions.
W2 (SPI of 1.3 to 1.5)
The Standardized Precipitation Index (SPI) value for this location is between 1.3 to 1.5, indicating severe wet (W2) conditions.
W3 (SPI of 1.6 to 1.9)
The Standardized Precipitation Index (SPI) value for this location is between 1.6 to 1.9, indicating extreme wet (W3) conditions.
W4 (SPI of 2.0 or more)
The Standardized Precipitation Index (SPI) value for this location is 2.0 or greater, indicating exceptional wet (W4) conditions.
Drought results from an imbalance between water supply and water demand. The Standardized Precipitation Index (SPI) measures water supply, specifically precipitation. SPI captures how observed precipitation (rain, hail, snow) deviates from the climatological average over a given time period—in this case, over the 9 months leading up to the selected date. Red hues indicate drier conditions, while blue hues indicate wetter conditions. Data are available monthly from 1895–present. Learn more.
Dry Conditions
D4 (PMDI of -5.0 or less)
Tree rings were used to reconstruct a Palmer Modified Drought Index (PMDI) value for each June–August, estimating relative dryness. The PMDI value for this location is -5.0 or less, indicating exceptional drought (D4) conditions.
D3 (PMDI of -4.9 to -4.0)
Tree rings were used to reconstruct a Palmer Modified Drought Index (PMDI) value for each June–August, estimating relative dryness. The PMDI value for this location is -4.9 to -4.0, indicating extreme drought (D3) conditions.
D2 (PMDI of -3.9 to -3.0)
Tree rings were used to reconstruct a Palmer Modified Drought Index (PMDI) value for each June–August, estimating relative dryness. The PMDI value for this location is -3.9 to -3.0, indicating severe drought (D2) conditions.
D1 (PMDI of -2.9 to -2.0)
Tree rings were used to reconstruct a Palmer Modified Drought Index (PMDI) value for each June–August, estimating relative dryness. The PMDI value for this location is -2.9 to -2.0, indicating moderate drought (D1) conditions.
D0 (PMDI of -1.9 to -1.0)
Tree rings were used to reconstruct a Palmer Modified Drought Index (PMDI) value for each June–August, estimating relative dryness. The PMDI value for this location is -1.9 to -1.0, indicating abnormally dry (D0) conditions.
Wet Conditions
W0 (PMDI of 1.0 to 1.9)
Tree rings were used to reconstruct a Palmer Modified Drought Index (PMDI) value for each June–August, estimating relative dryness. The PMDI value for this location is 1.0 to 1.9, indicating abnormally wet (W0) conditions.
W1 (PMDI of 2.0 to 2.9)
Tree rings were used to reconstruct a Palmer Modified Drought Index (PMDI) value for each June–August, estimating relative dryness. The PMDI value for this location is 2.0 to 2.9, indicating moderate wet (W1) conditions.
W2 (PMDI of 3.0 to 3.9)
Tree rings were used to reconstruct a Palmer Modified Drought Index (PMDI) value for each June–August, estimating relative dryness. The PMDI value for this location is 3.0 to 3.9, indicating severe wet (W2) conditions.
W3 (PMDI of 4.0 to 4.9)
Tree rings were used to reconstruct a Palmer Modified Drought Index (PMDI) value for each June–August, estimating relative dryness. The PMDI value for this location is 4.0 to 4.9, indicating extreme wet (W3) conditions.
W4 (PMDI of 5.0 or greater)
Tree rings were used to reconstruct a Palmer Modified Drought Index (PMDI) value for each June–August, estimating relative dryness. The PMDI value for this location is 5.0 or greater, indicating exceptional wet (W4) conditions.
In paleoclimatology, proxy climate data (e.g., tree rings, ocean sediments) can allow us to reconstruct past climate conditions before we had widespread instrumental records. The Living Blended Drought Atlas, shown here, estimates average drought conditions each summer (June–August) as far back as the year 0 by combining tree-ring reconstructions and instrumental records. Red hues indicate drier conditions, while blue hues indicate wetter conditions.