A measure of how cold a location was over a period of time, relative to a base temperature. In this report, the base temperature is 65 degrees Fahrenheit; the period of time is 1 year. The HDD for a single day is the difference between that day's average temperature and 65 degrees, if the daily average is below the base temperature, and zero if the daily average exceeds or equals the base temperature. The HDD for a longer period is the sum of daily HDD for days in that period.
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Cooling Degree-Days
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