This tool is an interactive map that provides gridded estimates of historic (1981–2019) annual number of days with warm daily low temperatures above 70°F, 75°F, and 80°F.
Future Projected Average Annual Number of Days with Warm Low Temperatures
This tool is excerpted from Chesapeake Bay Watershed Climate Impacts Summary and Outlook for Summer 2020.
- Similar to the trends in daily lows over the last several decades, the region is projected to see increases in the number of days with warm low temperatures.
- The largest increases in the average annual number of days with warm daily low temperatures are projected for a daily low temperature threshold of 70°F. On average, the region as a whole could see 53 days above this threshold by late-century in a high-emissions future. The region currently experiences eight days above this threshold.
- Under both future emissions scenarios, the southeastern portion of the Mid-Atlantic region is projected to experience the greatest increases in the number of days with warm daily lows.
- In a high-emissions future, parts of western Pennsylvania could see more than 40 days per year with warm daily lows.
- Future projections indicate that only a few regions might experience significant changes in the number of days with lows above 80°F. Included in this group are Baltimore, Maryland, and Washington, D.C.