Snow in Janesville, Wisconsin Winter storm alerts · 7-day snow forecast · average snowfall
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Janesville averages 36.6 inches of snow a year. The snowiest month is January (10.8″), and snow usually falls from October through April. On about 13 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″
<1
—
8
40°F
November
2.4″
1
—
21
29°F
December
7.7″
3
—
29
18°F
January
10.8″
4
—
30
12°F
February
10.1″
3
—
26
15°F
March
4.1″
1
—
24
25°F
April
1.3″
<1
—
10
36°F
May
0″
0
—
1
48°F
Year
36.6″
13
—
148
NOAA NCEI U.S. Climate Normals 1991–2020 — snowfall at Afton - Janesville Wwtp (4 mi from the city center, -82 ft elevation difference). Averages smooth out big years: single winters can bring half or double the normal.
36.6 inches in an average year (NOAA U.S. Climate Normals 1991–2020, Afton - Janesville Wwtp 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 Janesville'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 Janesville have?
About 148 nights a year drop to 32 °F or below (NOAA 1991–2020); the coldest month, January, averages a low of 12 °F.