Cooling degree days
Sum over January to December of the degrees by which the daily mean temperature exceeds 65°F, a measure of cooling demand. NOAA estimates monthly values from nClimDiv temperatures and weights areas by population (2010 Census).
NOAA publishes these for operational monitoring; they can differ from official degree day publications.
Key facts
- Cooling degree days in the United States was 1,502 degree days (base 65°F) in 2025, according to NOAA National Centers for Environmental Information.
- Florida had the highest cooling degree days of 48 states in 2025, at 3,882 degree days (base 65°F), and Montana the lowest, at 237 degree days (base 65°F). Source: NOAA National Centers for Environmental Information.
- Published for 49 places, with figures from 1895 to 2025.
Rankings
US states by cooling degree days, 2025
Places with data
Countries
Regions and states
- California
- Texas
- Florida
- New York
- Pennsylvania
- Illinois
- Ohio
- Georgia
- North Carolina
- Michigan
- Virginia
- Vermont
- Washington
- Maryland
- Wisconsin
- Massachusetts
Use this data in your AI agent
Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:
Which places have the highest cooling degree days? Use official data and cite it.
rank_places {"indicator":"cooling_degree_days_annual","level":"region","within":"United States"}
GET https://invokely.ai/api/v1/rank?indicator=cooling_degree_days_annual&level=region&within=United%20States