Winnebago County Climate
Winnebago County, Iowa
Avg Annual Temp
44.9°F
Annual Precip
36.5"
Annual Snowfall
38.1"
Extreme Heat Days
9.4
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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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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.