Winter climate by state: heating degree days

A heating degree day total adds up, day by day, how far the mean temperature falls below a base temperature. NOAA's Climate Prediction Center describes degree days as an index of the energy needed to heat or cool buildings, so a higher value means more heating demand at that station.

Each value is the station's annual normal from NOAA's U.S. Climate Normals 1991-2020 (annual/seasonal) dataset. The station is the nearest one with an annual heating degree day normal, found within a search box around the city's place point in the U.S. Census Bureau Gazetteer.