Sioux County Climate
Sioux County, Iowa
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
47.4°F
Annual Precip
29.4"
Annual Snowfall
31.6"
Extreme Heat Days
21
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5a
Minimum winter temperature range for plant survival
2,960
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Sioux County
Climate Verdict
Sioux County has a cool, averaging 47.4°F annually, moderate rainfall of 29.4 inches per year, occasional hot days — 20.95 per year above 90°F, moderate snowfall of 31.6 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 17.7°F. summers are warm — July averages 73.4°F. Residents experience a substantial 56°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Sioux County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Sioux County closely matches the Iowa statewide average temperature of 48.0°F, it is also noticeably drier, receiving 6.7 inches less precipitation than the state average.
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
What is the average temperature in Sioux County?
How much rain does Sioux County get?
Does it snow in Sioux County?
How hot does Sioux County get in summer?
How cold are winters in Sioux County?
Track your own weather in Sioux County
Ambient Weather personal weather stations give you hyperlocal climate data.
Sponsored
Data sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.