Snow in Rock Island, Illinois Winter storm alerts · 7-day snow forecast · average snowfall
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Rock Island averages 36.1 inches of snow a year. The snowiest month is January (10.8″), and snow usually falls from October through April. On about 11 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
0.3″
<1
—
5
43°F
November
2.1″
1
—
17
31°F
December
8.8″
3
—
27
21°F
January
10.8″
3
—
29
15°F
February
8.6″
2
—
25
19°F
March
4.4″
2
—
20
30°F
April
1.1″
<1
—
6
40°F
Year
36.1″
11
—
129
NOAA NCEI U.S. Climate Normals 1991–2020 — snowfall at Moline Quad City Intl. Airport (4 mi from the city center, +20 ft elevation difference). Averages smooth out big years: single winters can bring half or double the normal.
36.1 inches in an average year (NOAA U.S. Climate Normals 1991–2020, Moline Quad City Intl. Airport station, 4 miles away). The snowiest month is January with 10.8 inches.
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This page checks the National Weather Service for active alerts at Rock Island'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 Rock Island have?
About 129 nights a year drop to 32 °F or below (NOAA 1991–2020); the coldest month, January, averages a low of 15 °F.