For Degree-Day we have terms and definitions in 2 topics. The topics are Derivatives and Environment.

Degree-day (Derivatives)

A unit of measure for the deviation of a day's average temperature from the arbitrary standard of 65 degrees Fahrenheit. The U.S. Energy Information Administration publishes indexes of accumulated Degree Days. If the average temperature one day is 75 (55) degrees, then the index increases (decreases) ten Degree-Days on that day. Degree-days come in two varieties – Heating Degree-Days and Cooling Degree-Days. When the average temperature is above (below) 65 degrees, then the number of cooling (heating) Degree-Days increases.
(Source: Victor Kremer, "Utility to Make First Use of Degree-Day Swaps, Derivatives Week, 5/5/97.)

Degree-day (Environment)

A rough measure used to estimate the amount of heating required in a given area; is defined as the difference between the mean daily temperature and 65 degrees Fahrenheit. Degree-days are also calculated to estimate cooling requirements.

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