University of Alaska Fairbanks    |    Scenarios Network for Alaska + Arctic Planning

Heating Degree Days

The heating degree days are the cumulative annual degree days below 65°F.

Choose a location below by community name, coordinates, or by clicking on the map to select a point.

  • ✓  Modeled Historical (1980–2009, ERA Interim)
  • Projected Mid–Century (2040–2069, NCAR CCSM4, RCP 8.5)

Heating degree days

These layers show the historical or projected cumulative annual heating degree days across Alaska.

Degree days below 65°F
≥ 17500

Heating degree days, measured below 65°F, provide information upon which the annual fuel requirement for a heated building can be calculated. For example, assume that house heating begins when the air temperature is near 65°F. If a particular day has a mean temperature of 50°F, the heating load for the day is 15 degree days (65–50). For the entire year the heating degree days are the sum of the daily degree days. If the mean temperature for a particular day is higher than 65°F, there is assumed to be no heating and thus no heating degree days.

Higher values for heating degree days suggest colder, longer winters.