Dec 13, 2017
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Climate Matters has expanded geographically, so we updated our historical chance of a White Christmas analysis to 244 cities in the U.S. — covering all Nielsen markets. White Christmas is defined here as having at least an inch of snow on the ground on Christmas Day. In addition, the analysis includes the record highest snow depth
However, the relationship is more complex at each local level. Rising temperatures can cause some individual storms to produce more snow, where temperatures are still well enough below freezing. That’s because for every 1°F rise in temperature, the atmosphere can hold 4 percent more water vapor. In turn, more water is available to fall as snow or rain.
METHODOLOGY: The White Christmas graphic illustrates the probability of 1”+ of snow depth based on analysis of the 1981-2010 NOAA/NCEI climatological normal. Record snow depth for each city comes from the Applied Climate Information System. North American snow cover data is from Rutgers University Global Snow Lab. Each point represents the average annual snow depth from July to June. Data begins in 1973, when satellite resolution was upgraded for suitable snow depth mapping accuracy.
Jan 27, 2016
Different parts of the country have their coldest days of winter at different times of the season.
Feb 10, 2016
The ratio of snow to rain that falls each winter season will change in a warming world.
Nov 29, 2017
Winters are warming across the U.S., and in some locations, the warming is dramatic. The Northern Plains, Great Lakes, and the Northeast are warming the fastest, while warming is taking place at a slower rate in the western U.S.