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It's more based on a smaller celebration (taking place on the 13th of December) that's not commonly celebrated outside Fennoscandinavia and Italy, rather than Christmas proper.
At this point it's got way more "Christmas spirit" than actual Christmas IMO, so I've decided that that's how all my Christmas themed avatars will look, should I ever decide I need more.
And I dunno exactly how cold, just that it's too cold to comfortably sit around in just a t-shirt.