degree-day
noun
de·gree-day
di-ˈgrē-ˌdā 
: 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
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“Degree-day.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/degree-day. Accessed 29 Nov. 2024.
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