Sioux County Climate
Sioux County, Iowa
Avg Annual Temp
47.4°F
Annual Precip
29.4"
Annual Snowfall
31.6"
Extreme Heat Days
20.95
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Sioux County Weather
Cooler and Drier Sioux County Climate
Sioux County averages 47.4°F annually, which is significantly cooler than the national median temperature. Its position in the northwest makes it a drier-than-average representative of the continental climate zone.
A Chillier Notch on the State Map
The county's 47.4°F annual average is lower than the Iowa state average of 48.0°F. It represents the cooler, wind-swept northern tier of the state where winters hold a stronger grip.
One of Iowa’s Driest Counties
With only 29.4 inches of annual precipitation, Sioux County is much drier than the state average of 36.1 inches. This 6.7-inch deficit distinguishes it from the rainier counties in eastern Iowa.
Extreme Heat Days and Snowy Winters
Despite its northern location, the county faces 21 days of heat over 90°F each summer. Winters are rigorous, featuring a January average of 17.7°F and 31.6 inches of annual snowfall.
Prepare for Wide Temperature Extremes
Residents need high-efficiency cooling to handle the 21 days of extreme summer heat. Winter readiness is equally critical, as the county receives more snow than most of its southern neighbors.
Frequently Asked Questions
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.