Cheyenne, WY – Wyoming is entering a wintry and potentially disruptive pattern from December 18–24, with NOAA’s outlook showing below-normal temperatures across northern and eastern Wyoming and above-normal precipitation in several regions. This setup supports heavy mountain snow, plains snow, and pockets of freezing rain—especially where cold air becomes trapped in basins.
According to NOAA, northern Wyoming—including Sheridan, Gillette, Buffalo, and the Bighorn Basin—sits squarely in the below-normal temperature zone, giving strong confidence that all precipitation will fall as snow. Several waves of accumulating snow are possible from December 19–23. Gusty winds may create areas of drifting snow on I-90 and U.S. 14.
Central and basin regions—including Casper, Riverton, Worland, and Thermopolis—may experience elevation–temperature interactions that allow for occasional freezing drizzle or light ice, especially from December 19–21. Basins often hold shallow cold air, creating conditions ideal for freezing rain, even when upper-level temperatures are slightly warmer. Travel hazards may be significant during the morning commute.
Western Wyoming—including Jackson, Afton, Alpine, and the Teton & Wind River Ranges—can expect consistent mountain snow, with periods of heavy snowfall under enhanced Pacific moisture. Travel through mountain passes such as Teton Pass and Togwotee Pass may become dangerous with near-whiteout conditions.
Southeastern Wyoming—including Cheyenne, Laramie, Wheatland, and Torrington—will see a mix of plains snow and gusty winds. Light to moderate snow is likely through the week, with colder air returning by December 22–24, increasing snow potential as Christmas Eve approaches.
Major travel routes—including I-80, I-25, I-90, U.S. 287, and Highway 26—may face snow-covered roads, reduced visibility, black ice, and delays, especially from December 21 through Christmas Eve.
