this post was submitted on 23 Apr 2025
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I would imagine that it is linked to the rainward side of the Urals, which I would imagine have more cloud and so would promote a selection for improved Vitamin D production, as with Ireland.
Uh, the Northern latitudes have a bit to do with it, sure.
But you'll notice the northern most part of Scotland is still further south than the southernmost point of Finland, yet there's less gingers.
Do you know another thing which influences the prevalence of gingers?
Incest.
A good deal of the current Scottish population are descended from the Irish, which goes some way to explaining that side of your comparison, but I am not aware of Finland being particularly cloudy.
I have not consulted any climatic records, but I would have expected it to be less cloudy than the rest of Scandinavia, really, since the rain will have been deposited on the mountain in Norway and Sweden before the air masses reach Finland.
but clouds don't really affect light levels that much, meanwhile up north it's just.. straight up night for most of the day during the winter.