These are the long term average probabilities. Actual areal predicted snowfall conditions for Christmas will be based on your local weather forecasts issued close to Christmas day. It's an age-old question that occurs to almost everyone this time of year. The above map shows the climatological probabilities of a white Christmas. The map is just one of 737 maps now available on NCDC's new Climatic Atlas.
Highest probabilities are in northern and mountainous areas of the country.
NCDC also has a separate report which contains maps and tables showing the percent probabilities for a snow depth of at least 1 inch on Christmas morning, as well as the probabilities for a depth of at least 5 inches and 10 inches. Only stations with at least 25 years of data were used and the '61-'90 period was chosen to coincide with the standard period for computing climatological normals. The actual conditions this year may vary widely from these probabilities. The snow on the ground or snowfall on Christmas day will be based on the actual weather pattern during that time. These probabilities are useful as a guide only to show where snow on the ground is more likely.