Snow in Crystal Lake, Illinois Winter storm alerts · 7-day snow forecast · average snowfall
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Crystal Lake averages 35.1 inches of snow a year. The snowiest month is January (10.0″), and snow usually falls from October through April. On about 12 days a year at least an inch falls. Snow covers the ground (1″+) on roughly 54 days of an average winter.
Average snowfall by month
Month
Snowfall
Days 1″+
Days with snow cover
Freezing nights
Avg. low
October
0.2″
<1
0
3
42°F
November
1.6″
1
2
18
31°F
December
8.7″
3
11
27
20°F
January
10.0″
3
18
29
14°F
February
9.0″
3
17
27
16°F
March
4.4″
2
7
22
26°F
April
1.2″
1
1
9
37°F
Year
35.1″
12
54
136
NOAA NCEI U.S. Climate Normals 1991–2020 — snowfall at Crystal Lake 4nw (4 mi from the city center, +33 ft elevation difference). Averages smooth out big years: single winters can bring half or double the normal.
35.1 inches in an average year (NOAA U.S. Climate Normals 1991–2020, Crystal Lake 4nw station, 4 miles away). The snowiest month is January with 10.0 inches.
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How many freezing nights does Crystal Lake have?
About 136 nights a year drop to 32 °F or below (NOAA 1991–2020); the coldest month, January, averages a low of 14 °F.