cooling degree day (CDD)
A day in which the average daily temperature is more than 65 degrees Fahrenheit, and therefore likely to be a day in which people turn on their air conditioning. A Cooling Degree Day is assigned a value that represents the number of degrees that day's average temperature exceeds 65 degrees. For example, if a day's average temperature is 85 degrees, the CDD value for that day would be 20 (85 €" 65). If the average temperature is less than or equal to 65 degrees, the CDD value for the day would be zero. (The day would not be sufficiently warm enough to require air conditioning.)

Financial and business terms. 2012.

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