One of NOAA's most popular interactive maps is the First Snow Map, which provides a nationwide guide to when you can expect the first snow of the winter. The map shows the date at your location when the chance of snow is at least 50%, based on historical weather records. NOAA have also created a similar looking map which shows the historical predictability of whether you can expect a white Christmas.
The Are you dreaming of a white Christmas? map uses historical weather data to provide a prediction of the chance of experiencing at least 1 inch of snow at your location on Christmas Day. The whiter the map at your location then the more chance you have of having a white Christmas. The chances of you experiencing a white Christmas are based on the last three decades of weather records at your location.
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