Snow in Sioux City, Iowa Winter storm alerts · 7-day snow forecast · average snowfall
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Sioux City averages 36.0 inches of snow a year. The snowiest month is February (8.7″), and snow usually falls from October through April. On about 11 days a year at least an inch falls. Snow covers the ground (1″+) on roughly 58 days of an average winter.
Average snowfall by month
Month
Snowfall
Days 1″+
Days with snow cover
Freezing nights
Avg. low
September
0″
0
0
1
51°F
October
0.8″
<1
<1
9
38°F
November
3.2″
1
3
23
25°F
December
7.6″
3
13
30
15°F
January
7.7″
2
20
31
10°F
February
8.7″
3
15
27
15°F
March
5.7″
2
7
23
26°F
April
2.3″
1
1
10
37°F
May
0″
0
0
1
49°F
Year
36.0″
11
58
154
NOAA NCEI U.S. Climate Normals 1991–2020 — snowfall at Sioux City Gateway Airport (8 mi from the city center, -98 ft elevation difference). Averages smooth out big years: single winters can bring half or double the normal.
36.0 inches in an average year (NOAA U.S. Climate Normals 1991–2020, Sioux City Gateway Airport station, 8 miles away). The snowiest month is February with 8.7 inches.
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How many freezing nights does Sioux City have?
About 154 nights a year drop to 32 °F or below (NOAA 1991–2020); the coldest month, January, averages a low of 10 °F.