Snow in St. Charles, Illinois Winter storm alerts · 7-day snow forecast · average snowfall
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St. Charles averages 46.2 inches of snow a year. The snowiest month is February (13.0″), and snow usually falls from October through April. On about 14 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
0.2″
0
—
5
42°F
November
3.7″
1
—
17
31°F
December
10.2″
4
—
27
21°F
January
11.2″
4
—
29
16°F
February
13.0″
4
—
26
19°F
March
5.0″
1
—
21
28°F
April
2.9″
1
—
8
38°F
May
0″
0
—
1
49°F
Year
46.2″
14
—
134
NOAA NCEI U.S. Climate Normals 1991–2020 — snowfall at St. Charles 0.1 E (1 mi from the city center, +26 ft elevation difference); temperatures at West Chicago Dupage Airport. Averages smooth out big years: single winters can bring half or double the normal.
46.2 inches in an average year (NOAA U.S. Climate Normals 1991–2020, St. Charles 0.1 E station, 1 miles away). The snowiest month is February with 13.0 inches.
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This page checks the National Weather Service for active alerts at St. Charles'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 St. Charles have?
About 134 nights a year drop to 32 °F or below (NOAA 1991–2020); the coldest month, January, averages a low of 16 °F.