Winona County Climate
Winona County, Minnesota
Avg Annual Temp
47.3°F
Annual Precip
35.9"
Annual Snowfall
38.5"
Extreme Heat Days
10.94
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Winona County Weather
Winona's Mild Standing in America
Winona’s 47.3°F average is cool by national standards but warm for the Upper Midwest. It experiences a classic continental climate moderated slightly by the Mississippi River valley.
Leading the State in Warmth
The county is one of Minnesota's warmest, averaging 4.5 degrees higher than the state mean. It consistently ranks in the top tier for temperature among the 87 counties.
The Wettest of the Region
With 35.9 inches of annual precipitation, Winona is wetter than Watonwan's 33.1 inches. This moisture supports the lush vegetation found along the river bluffs.
Short Winters and Humid July Days
Snowfall is lighter here at 38.5 inches compared to many neighbors. However, July averages 73.5°F and brings 11 days of extreme heat.
Home Maintenance in the Valley
Homeowners should prioritize basement waterproofing for the 35.9 inches of annual rain. Reliable air conditioning is necessary to manage the 11 days of 90-degree heat.
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.