A small temperature change can shift precipitation from valley rain to mountain snow.
Pacific Northwest & Sierra
White Christmas in the Pacific mountains
The Pacific states contain some of the snowiest mountains in the country and some famously mild lowland cities. Elevation and the freezing level determine which side of that divide a location falls on.
Check the place that matters.
Check local 2026 oddsRegional climate sets the background; the live tool resolves the actual city, town or ZIP.
What drives Christmas snow here?
Moist Pacific systems can build enormous mountain snowpack when temperatures are cold enough.
Warm atmospheric-river events can compress or melt lower-elevation snowpack quickly.
Why local matters: Seattle, Portland and Sacramento are poor proxies for nearby mountain destinations. The regional question is fundamentally an elevation question.
Check cities and destinations
Spokane, WALeavenworth, WAWenatchee, WABend, ORKlamath Falls, ORBoise, IDTruckee, CASouth Lake Tahoe, CAReno, NVMount Shasta, CA
Historical context
See the U.S. White Christmas probability map for the broad 1991–2020 pattern.
Christmas-week planning
See when the short-range forecast becomes more useful than climatology.