-
Federal
Heating and Cooling Degree Day by State, 1960–2023 Versus 1895–1959
U.S. Environmental Protection Agency —
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... -
Federal
Change in Ragweed Pollen Season, 1995-2015
U.S. Environmental Protection Agency —
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... -
Federal
Change in Snowfall
U.S. Environmental Protection Agency —
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... -
Federal
Change in Glacier Surface Area in Glacier National Park, 1966–2015
U.S. Environmental Protection Agency —
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... -
Federal
Average Rate of Heat-Related Hospitalizations in 23 States, 2001-2010
U.S. Environmental Protection Agency —
This map shows the 2001–2010 average rate of hospitalizations classified as “heat-related” by medical professionals in 23 states that participate in CDC’s... -
Federal
Streamflow in the United States, 1940–2022
U.S. Environmental Protection Agency —
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... -
Federal
Change in First Leaf and Bloom Dates Between 1951–1960 and 2014–2023
U.S. Environmental Protection Agency —
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... -
Federal
Change in Unusually Hot and Cold Temperatures in the Contiguous 48 States, 1948–2023
U.S. Environmental Protection Agency —
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... -
Federal
Length of Growing Season, 1895–2023
U.S. Environmental Protection Agency —
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... -
Federal
Change in Ice Thaw Dates for Selected U.S. Lakes, 1905-2019
U.S. Environmental Protection Agency —
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... -
Federal
Changes in Stream Water Temperatures in the Chesapeake Bay Region, 1960-2014
U.S. Environmental Protection Agency —
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... -
Federal
Change in the Magnitude of River Flooding in the United States, 1965-2015
U.S. Environmental Protection Agency —
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...