Washington Winter Forecast 2026–27: Snow, Cold & First Snow

NOAA's Climate Prediction Center outlook (issued August 20, 2026) puts Washington at milder than normal for temperature and equal chances (no lean) for precipitation over December–February, with El Niño driving the pattern, read off CPC's official map at the state's three reference cities. CPC draws its probability bands by region rather than issuing a call for each state, so where a state's cities straddle two bands we show equal chances — the official maps are at cpc.ncep.noaa.gov. A milder tilt with no precipitation lean usually means snowfall slightly below normal — fewer days cold enough for snow, not necessarily fewer storms. Seasonal outlooks never forecast snowfall totals, and Seattle's 1991–2020 normal of 6 in remains the best single planning number.

The median first measurable snow (0.1 in or more) in Seattle is December 20; about one year in ten it arrives by November 25, and some winters it barely comes at all. Washington's snow belt (Mount Baker) usually records its first snow weeks earlier.

December is the coldest month in Seattle, with a normal January high of 48°F and low of 38°F. The all-time state record low is -48°F at Mazama & Winthrop in 1968.

Seattle averages 6 in of snow per season (NOAA 1991–2020 normals), with January the snowiest month. Statewide totals vary enormously: Seattle ~6 in, Spokane ~45 in, Yakima ~20 in. The heaviest totals fall in Washington's snow belt (Mount Baker): world record 1,140 in in 1998–99.

The Farmers' Almanac and Old Farmer's Almanac publish winter forecasts from undisclosed formulas and have never shown skill beyond chance in independent checks. NOAA's Climate Prediction Center publishes probabilities with stated skill and updates monthly. Even NOAA's outlook is only a tilt, so the ranking is: NOAA's tilt first, Washington's 30-year normals second, and the almanacs for entertainment.

El Niño conditions are present and strengthening. In its August 13, 2026 ENSO Diagnostic Discussion, CPC gave a greater than 90% chance of a very strong event during fall and winter 2026–27, and a 69% chance that the October–December season sets a record (+2.5°C or more, 3-month RONI) for any El Niño since 1950. CPC is explicit that impacts consistent with El Niño become more likely with an event this large, but are not guaranteed. For Washington, CPC's map puts that at milder than normal for temperature and equal chances (no lean) for precipitation — taken from CPC's official Dec–Feb probability map at each state's three reference cities, since CPC publishes probabilities by region rather than a call per state. Coastal California is the headline — CPC raised above-normal precipitation odds above 50% for DJF through FMA, citing the wet Februaries of 1998 and 2024 in similar east-Pacific El Niños; California leans milder as well. Oregon and Washington are favored milder than normal with equal chances on precipitation (the usual El Niño dry tilt was deliberately left off the coast). Alaska leans milder, with the strongest warm confidence in the outlook over the southeast panhandle, and reads as equal chances on precipitation at our three reference cities even though the discussion describes a drier mainland pattern. Hawaii is equal chances on both.

Washington rates 1 of 5 (low) on our freezing-rain scale. Washington rarely sees damaging freezing rain. Where ice is a problem it is black ice on roads after a thaw-refreeze, not accumulation on lines and trees.

Anchor it to the first frost: Washington's typical first frost is October 28, and a hard freeze (28°F) usually follows within about two weeks — around November 11. Blow out sprinklers and disconnect hoses before the hard freeze, service the furnace by then, and have winter tires on before December 20.