Winona County Climate
Winona County, Minnesota
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
47.3°F
Annual Precip
35.9"
Annual Snowfall
38.5"
Extreme Heat Days
11
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
4b
Minimum winter temperature range for plant survival
2,920
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Winona County
Climate Verdict
Winona County has a cool, averaging 47.3°F annually, moderate rainfall of 35.9 inches per year, rare extreme heat with only 10.940000000000001 days above 90°F annually, moderate snowfall of 38.5 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 17.3°F. summers are warm — July averages 73.5°F. Residents experience a substantial 56°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Winona County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Winona County is 4.5°F warmer than the Minnesota statewide average of 42.8°F, it is also noticeably wetter, receiving 5.8 inches more precipitation than the state average.
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 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.