Winnebago County Climate
Winnebago County, Iowa
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
44.9°F
Annual Precip
36.5"
Annual Snowfall
38.1"
Extreme Heat Days
9
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5a
Minimum winter temperature range for plant survival
2,601
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Winnebago County
Climate Verdict
Winnebago County has a cool, averaging 44.9°F annually, moderate rainfall of 36.5 inches per year, rare extreme heat with only 9.4 days above 90°F annually, moderate snowfall of 38.1 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 14.1°F. summers are warm — July averages 71.4°F. Residents experience a substantial 57°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Winnebago County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Winnebago County is 3.1°F cooler than the Iowa statewide average of 48.0°F.
Climate Profile
About Winnebago County Weather
A Cold Northern Tier Climate
Winnebago County is one of the cooler locations in the U.S., with an annual average of just 44.9°F. This represents a true northern continental climate.
One of Iowa's Coldest Counties
At 44.9°F, Winnebago is significantly colder than the Iowa state average of 48.0°F. Its winter average of 17.7°F is among the lowest in the state.
Colder and Drier Than Neighbors
Winnebago is notably colder than Webster County's 46.5°F average. It experiences more severe winter conditions than almost any other county in the central Iowa region.
Harsh Winters and Rare Heat
Winter dominates with 38.1 inches of snow and a freezing 14.1°F January average. Summer heat is rare, with only 9 days per year reaching 90°F.
Prepare for Extreme Winter Cold
Heavy-duty thermal insulation and emergency winter car kits are vital here. With only 9 days of extreme heat, many residents prioritize heating over intensive air conditioning.
Frequently Asked Questions
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Track your own weather in Winnebago County
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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.