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There is a page named "File:United States Heating Degree Day map, 1961-1990.jpg" on Wikipedia
DescriptionUnited States Heating Degree Day map, 1961-1990.jpg English: Annual heating degree days in the United States, based on normal period 1961-1990. Date...(2,100 × 1,600 (644 KB)) - 04:37, 6 January 2020
allowed to claim copyright and is therefore in the public domain in the United States. Definition of "public record" Public records are works "made or received...(1,650 × 1,275 (2.16 MB)) - 20:23, 13 December 2020
