Buchanan County Climate
Buchanan County, Iowa
Avg Annual Temp
46.2°F
Annual Precip
38.0"
Annual Snowfall
33.9"
Extreme Heat Days
10.1
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Buchanan County Weather
A Classic Upper Midwest Climate
Buchanan County's annual average temperature of 46.2°F falls well below the national median of 53°F. This humid continental region experiences the wide temperature swings characteristic of the American heartland.
Chillier Than the Iowa Average
Averaging 1.8 degrees cooler than the Iowa state mean of 48.0°F, Buchanan is one of the state's more temperate northern counties. This cooler baseline affects everything from the growing season to home energy costs.
Mirroring Eastern Iowa Trends
The county's climate is nearly identical to Bremer County's 46.4°F average. It receives 38.0 inches of annual precipitation, which is roughly two inches more than the state average of 36.1 inches.
Balanced Heat and Winter Snow
Residents enjoy mild summers with an average of 69.9°F and only 10 days of extreme heat over 90°F. Winter brings a steady 33.9 inches of snowfall and a frigid January average of 16.6°F.
Gear Up for Winter Transitions
The combination of nearly 34 inches of snow and a 19.9°F winter average makes a reliable snowblower a local essential. Residents should also plan for a wet spring, as the county receives more precipitation than much of western Iowa.
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.