National Climatic Data Center (U.S.), Research Customer Service Group,

"Will we have a white Christmas? It's an age-old question that occurs to almost everyone this time of year. The National Climatic Data Center (NCDC) has created a new report which contains updated 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"--Introduction.

Technical Report

United States

National Environmental Satellite and Data Information Service (NESDIS)