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Heating degree days and cooling degree days are climatalogical metrics used to express the magnitude of the heating or cooling load in a given location. These metrics are expressed in terms of a "base temperature" (e.g., "Heating Degree Days Base 65 F"). Heating degree days are calculated by taking the daily average temperature; if it is colder than the "base temperature," the difference is calculated. This difference is summed for the period (week, month, year) in question.