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

NOAA's Climate Prediction Center outlook (issued August 20, 2026) puts Delaware at milder than normal for temperature and wetter than normal 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. More storms, marginal cold: expect an active winter where the rain/snow line decides everything. Elevation and the interior are the safer snow bets; valley and coastal totals often finish below normal in this combination. Seasonal outlooks never forecast snowfall totals, and Wilmington's 1991–2020 normal of 19 in remains the best single planning number.

The median first measurable snow (0.1 in or more) in Wilmington is December 22; about one year in ten it arrives by November 28, and one in ten waits until January 20 or later. Delaware's snow belt (Piedmont north of the C&D Canal) usually records its first snow weeks earlier.

January is the coldest month in Wilmington, with a normal January high of 42°F and low of 27°F. The all-time state record low is -17°F at Millsboro in 1893.

Wilmington averages 19 in of snow per season (NOAA 1991–2020 normals), with February the snowiest month. Statewide totals vary enormously: Wilmington ~19 in, Dover ~12 in, Georgetown ~9 in. The heaviest totals fall in Delaware's snow belt (Piedmont north of the C&D Canal).

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, Delaware'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 Delaware, CPC's map puts that at milder than normal for temperature and wetter than normal 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. The Southeast carries the strongest precipitation signal in the entire outlook: above-normal probabilities exceed 60% in places, with the wet tilt running up nearly the whole East Coast. Temperature leans milder across most of the region too — Virginia and the Carolinas through Georgia, Alabama, Arkansas and the Tennessee Valley — while Florida, Mississippi and Louisiana read as equal chances. Mild and wet is not a snow recipe, but it is an ice recipe every time a shallow cold shot arrives, which is the Carolina piedmont, north Georgia and the Tennessee Valley story. Kentucky and Tennessee read as equal chances on precipitation.

Delaware rates 3 of 5 (moderate) on our freezing-rain scale. Delaware sees freezing rain a few times each winter, usually as a brief glaze at the start or end of a storm rather than a multi-day event — though the interior and valleys can trap cold air and get a real ice storm once a decade.

Anchor it to the first frost: Delaware'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 22.