this post was submitted on 08 Jul 2025
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[โ€“] Skua@kbin.earth 15 points 1 day ago (1 children)

The American one seems to match this, which has "National Climatic Data Center's U.S. Stations 1961-1990 Monthly Normals for the Atypical Climate Elements" as its source.

The European one seems to be from this Wikimedia Commons user, but they never specified their source beyond "according to national data"

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