Snow in O'Fallon, Missouri Winter storm alerts · 7-day snow forecast · average snowfall
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O'Fallon averages 14.8 inches of snow a year. The snowiest month is February (5.0″), and snow usually falls from November through April. On about 5 days a year at least an inch falls. Snow covers the ground (1″+) on roughly 17 days of an average winter.
Average snowfall by month
Month
Snowfall
Days 1″+
Days with snow cover
Freezing nights
Avg. low
October
0″
0
0
3
45°F
November
0.8″
<1
1
13
34°F
December
2.7″
1
4
23
26°F
January
4.7″
1
6
26
22°F
February
5.0″
2
5
22
26°F
March
1.5″
1
1
14
34°F
April
0.1″
<1
0
4
44°F
Year
14.8″
5
17
105
NOAA NCEI U.S. Climate Normals 1991–2020 — snowfall at St Peters 2 Se (7 mi from the city center, +36 ft elevation difference); temperatures at St Louis Sprt Of S L Airport. Averages smooth out big years: single winters can bring half or double the normal.
14.8 inches in an average year (NOAA U.S. Climate Normals 1991–2020, St Peters 2 Se station, 7 miles away). The snowiest month is February with 5.0 inches.
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How many freezing nights does O'Fallon have?
About 105 nights a year drop to 32 °F or below (NOAA 1991–2020); the coldest month, January, averages a low of 22 °F.