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Seasonal Affective Disorder (S.A.D.) is as you would expect higher in Northern US than in the South and higher in northern latitudes generally. A major exception to this rule is the nearly Arctic Iceland, which has rates lower than the US average :https://jamanetwork.com/journals/jamapsychiatry/article-abstract/496414 …
The only significant Icelandic population outside of Iceland resides in the interior provinces of Canada. The descendants of Icelandic immigrants to Manitoba just mysteriously do not get S.A.D. in the winter time.https://jamanetwork.com/journals/jamapsychiatry/article-abstract/496419 …
Icelanders have undergone more interesting physical changes in response to climate than any other Europeans. These include their muscularity/short limbs as an adaptation to wet-cold (similar to Polynesians) and a mandibular torus as adaptions to a hard diet (similar to Eskimos).
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