A persistently cold pattern through the Christmas holiday should keep any snow from melting over a large part of the northern tier of states from parts of the Northwest, through the northern and central Plains, Upper Mississippi Valley, Great Lakes, and Northeast.
Furthermore, an active jet-stream track along that cold air should provide multiple chances of additional snowfall through the holiday.
However, a potential Christmas week thaw puts the southern edge of that snowcover in jeopardy, particularly in parts of the Northeast.
The map below indicates where there is the best chance for a white Christmas in any given year, based on climatological averages over the last three full decades.
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