Snow in Decatur, Illinois Winter storm alerts · 7-day snow forecast · average snowfall
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Decatur averages 13.6 inches of snow a year. The snowiest month is January (5.9″), and snow usually falls from November through April. On about 6 days a year at least an inch falls.
Average snowfall by month
Month
Snowfall
Days 1″+
Days with snow cover
Freezing nights
Avg. low
October
0″
0
—
3
44°F
November
0.4″
<1
—
14
34°F
December
3.5″
1
—
24
25°F
January
5.9″
2
—
27
20°F
February
2.5″
1
—
24
23°F
March
0.9″
1
—
17
32°F
April
0.4″
<1
—
5
42°F
Year
13.6″
6
—
113
NOAA NCEI U.S. Climate Normals 1991–2020 — snowfall at Decatur Wtp (1 mi from the city center, -36 ft elevation difference); temperatures at Decatur Airport. Averages smooth out big years: single winters can bring half or double the normal.
13.6 inches in an average year (NOAA U.S. Climate Normals 1991–2020, Decatur Wtp station, 1 miles away). The snowiest month is January with 5.9 inches.
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This page checks the National Weather Service for active alerts at Decatur's location every time you open it; the box at the top lists any winter storm, winter weather, cold or freeze alert in effect right now.
How many freezing nights does Decatur have?
About 113 nights a year drop to 32 °F or below (NOAA 1991–2020); the coldest month, January, averages a low of 20 °F.