degree-day

noun
de·gree-day | \di-ˈgrē-ˌdā \

Definition of degree-day 

: a unit that represents one degree of difference from a given point (such as 65°) in the mean daily outdoor temperature and that is used especially to measure heat requirements

First Known Use of degree-day

1832, in the meaning defined above

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The first known use of degree-day was in 1832

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