Coldest Days of Winter
Los Días Más Fríos del Invierno
Jan 27, 2016
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Much of the West usually has its coldest days early in the winter season. In the Southeast, the cold peak often comes a little later — in early January — whereas in the Northeast, the coldest days do not typically come until mid to late January. According to NOAA, the areas that record their coldest days late in the season, such as the Great Lakes and high elevations of the Rockies, tend to be the areas that average more snow on the ground during winter. Snow is a great reflector of incoming solar energy, so it blocks the ground from absorbing energy and warming up.
Methodology: This map is derived from the 1981–2010 U.S. Climate Normals — NCEI’s 30-year averages of climatological variables, including the average low temperature for every day. To find the coldest day, Climate Central identified the minimum low temperature at each site. If there are multiple days at this temperature, the median day was determined and placed in a range of days referred to here as the “coldest day.”
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.
Feb 4, 2015
Most cities could see at least a 25% reduction in the number of cold nights by mid-century, and at least a 50% reduction by the end of the century.