The 1991–2020 Climate Normals are the latest three-decade averages of several climatological measurements. Explore an interactive version of this map, which includes station-based data for Alaska.(Sorry West Coast, Gulf Coast, Deep South!) White shows probabilities greater than 90 percent. ( Interpolating means estimating values where you don’t have direct observations, using existing observations and physical relationships, such as the way temperature changes with altitude.) Darkest gray shows places where the probability is less than 10%. Using those station data, experts interpolated values for all locations in the Lower 48. Climate Normals from NOAAs National Centers for Environmental Information (NCEI). This map shows the historic probability of there being at least 1 inch of snow on the ground at weather stations across the United States on December 25 based on the latest (1991-2020) U.S. These are the parts of the United States where weather history suggests you want to be if you're looking for the best chance of a white Christmas. And of course, the Rockies or the Sierra Nevada Mountains. The Allegheny Mountains of Pennsylvania and West Virginia.
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