#Xmas snow images update

If you’re tempted to compare the two maps for signs of the influence of long-term warming, keep a few things in mind.įirst, comparing two adjacent Normals periods is not the most direct way to look for climate change.

#Xmas snow images update

Long-time readers of will know that this map is an update of an analysis originally made by NCEI experts using data from the 1981-2010 U.S. These probabilities are useful as a guide only to show where snow on the ground is more likely. For prediction of your actual weather on Christmas, check out your local forecast at. While the map shows the historical probability that at least 1 inch of snow will be observed on December 25, the actual conditions in any year may vary widely from these because the weather patterns present will determine the snow on the ground or snowfall on Christmas day. This collection contains daily and monthly Normals of temperature, precipitation, snowfall, heating and cooling degree days, frost/freeze dates, and growing-degree days calculated from observations at nearly 15,000 stations, the majority of which are operated by operated by NOAA’s National Weather Service.

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.