Will we have a white Christmas? It’s an age-old question that occurs to almost everyone this time of year. This report, created by the National Climatic Data Center (NCDC), 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.
The “First Order” Summary of Day Dataset for the period of 1961-1990 was used to compute these statistics. 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.