# Degree Days from High and Low Temperature

Equations

If the mean temperature is below 65°F, heating degree days occurred:

If the mean temperature is above 65°F, cooling degree days occurred:

In the above equations, HDD are the heating degree days in °F, CDD are the cooling degree days in °F, T_{HI} is the high temperature in °F, and T_{LO} is the low temperature in °F.