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U.S. Level III and IV Ecoregions (U.S. EPA)
This map service displays Level III and Level IV Ecoregions of the United States and was created from ecoregion data obtained from the U.S. Environmental Protection Agency... -
Heating and Cooling Degree Day by State, 1960–2023 Versus 1895–1959
This indicator shows how heating and cooling degree days have changed by state, based on a comparison of the first 65 years of available data (1895–1959) with the most recent 64... -
Change in Glacier Surface Area in Glacier National Park, 1966–2015
This map shows the change in surface area of all 37 named glaciers in Glacier National Park for 1966, 1998, 2005, and 2015. The glacier footprints for four different years are... -
Average Temperatures in the Southwestern United States, 2000–2023 Versus Long-Term Average
This indicator shows how the average air temperature from 2000 to 2023 has differed from the long-term average (1895 - 2023). To provide more detailed information, each state... -
Change in Unusually Hot and Cold Temperatures in the Contiguous 48 States, 1948–2023
This map shows trends in unusually hot and cold temperatures at individual weather stations that have operated consistently since 1948. In this case, the term “unusually hot”... -
Change in Summer Surface Water Temperatures of North American Lakes, 1985-2009
This map shows the total change in the average July–September surface water temperatures in 34 North American lakes from 1985 to 2009, as measured by satellites. Red circles... -
Changes in Stream Water Temperatures in the Chesapeake Bay Region, 1960-2014
This map shows the changes in stream water temperatures in the Chesapeake Bay region from 1960 to 2014. Blue circles represent cooling trends in stream water temperatures, and... -
EPA Office of Water (OW): Beaches NHDPlus Indexed Dataset
The Beaches Environmental Assessment and Coastal Health (BEACH) Program focuses on the following five areas to meet the goals of improving public health and environmental... -
Change in Permafrost Temperatures in Alaska, 1978-2023
This map shows the change in permafrost temperature per decade for long-term borehole sites in Alaska. As the circles get larger, the rate of warming per decade increases. The... -
Length of Growing Season, 1895–2023
This indicator looks at the impact of temperature on the length of the growing season in the contiguous 48 states, as well as trends in the timing of spring and fall frosts. For... -
Change in Ragweed Pollen Season, 1995-2015
This figure shows how the length of ragweed pollen season changed at 11 locations in the central United States and Canada between 1995 and 2015. Data were provided by Dr. Lewis... -
Streamflow in the United States, 1940–2022
This map shows percentage changes in the minimum annual rate of water carried by rivers and streams across the country, based on the long-term rate of change from 1940 to 2022.... -
Change in the Magnitude of River Flooding in the United States, 1965-2015
This figure shows changes in the size and frequency of flooding events in rivers and streams in the United States between 1965 and 2015. Blue upward-pointing symbols show... -
Change in Snowfall
This indicator shows the average rate of change in total snowfall from 1930 to 2007 at 419 weather stations in the contiguous 48 states. Blue circles represent increased... -
Change in First Leaf and Bloom Dates Between 1951–1960 and 2014–2023
This indicator shows modeled trends in lilac and honeysuckle first leaf dates at weather stations across the contiguous 48 states. This map compares the average first leaf date... -
Average Change in Drought (Five-Year SPEI) in the Contiguous 48 States, 1900–2020
This map shows how drought conditions have changed across the contiguous 48 states from 1900 to 2020. The data are showed for small regions called climate divisions, as defined... -
Change in Ice Thaw Dates for Selected U.S. Lakes, 1905-2019
This figure shows the change in the "ice-off" date, or date of ice thawing and breakup, for 14 U.S. lakes during the period from 1905 to 2019. All of the lakes have red circles... -
Change in Growing Degree Days in the Contiguous 48 States, 1948–2020
This map shows trends in the total number of growing degree days per year at 305 weather stations . The color and size of the symbols represent percent change between 1948 and...
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