A measure of the coldness of the weather experienced, based on the extent to which the daily mean temperature falls below a reference temperature, usually 65? F. For example, on a day when the mean outdoor dry-bulb temperature is 35? F, there would be 30 degree days experienced. A measure of seasonal variation and intensity of temperature. In residential customer load, the more degree days in a year than the “average,” the higher the utility bill.
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