From what I've read about the later years of WWII, the winter of '44/'45 was a particularly long, cold, and snowy one in NW Europe. I've never seen this mentioned before so there's probably nothing to it, but maybe the winter that year was more severe due to the large quantities of particulates thrown up by the intense strategic bombing of Germany and the surrounding, Nazi controlled territories in the preceding months/years.
It's possible, I suppose...
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