Snow in Joliet, Illinois Winter storm alerts · 7-day snow forecast · average snowfall
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Joliet averages 16.9 inches of snow a year. The snowiest month is February (6.2″), and snow usually falls from November through April. On about 7 days a year at least an inch falls. Snow covers the ground (1″+) on roughly 28 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
43°F
November
0.3″
<1
<1
16
32°F
December
3.2″
2
6
26
22°F
January
5.0″
3
12
28
17°F
February
6.2″
2
8
25
20°F
March
2.1″
1
2
21
29°F
April
0.1″
0
0
6
39°F
Year
16.9″
7
28
126
NOAA NCEI U.S. Climate Normals 1991–2020 — snowfall at Joliet Brandon Rd Dam (2 mi from the city center, -3 ft elevation difference). Averages smooth out big years: single winters can bring half or double the normal.
16.9 inches in an average year (NOAA U.S. Climate Normals 1991–2020, Joliet Brandon Rd Dam station, 2 miles away). The snowiest month is February with 6.2 inches.
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How many freezing nights does Joliet have?
About 126 nights a year drop to 32 °F or below (NOAA 1991–2020); the coldest month, January, averages a low of 17 °F.