I am going with the "Nuclear Winter" theory by Carl Sagan.
So between 3-5 years the particulates from the nuclear blast and the ash from major cities and massive uncontrollable forest fires has encircled the northern hemisphere.
There was no summer for two years, then short relatively cool summers for three more years adding to the starvation and deprivations of men and animals.
The upper reaches of Alaska, Canada, Greenland, Norway, Finland, and all of the Soviet Union above the Arctic Circle are buried under three meters of snow slowly compressing to ice.
The winters for the northern hemisphere is longer with freezing temperatures in the first week of november lasting to the first week of june.
The snow comes and stays until the spring thaw which is sudden and causes mass flooding.
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