NOAA has put out a map that indicates the average likelihood in any given year of a location having a white Christmas. The map is only valid for the continental United States. Nothing similar to this exists for Canada although Environment Canada has a listing of locations and probabilites. Accuweather has a map showing the chances of having a white Christmas for this year. Again, the map focuses on the U. S. with some overlap in Canada. The Weather Channel also has a similar map with slightly different probabilities.