Grant County Climate
Grant County, Wisconsin
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
47.0°F
Annual Precip
37.5"
Annual Snowfall
40.1"
Extreme Heat Days
10
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5a
Minimum winter temperature range for plant survival
2,743
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Grant County
Climate Verdict
Grant County has a cool, averaging 47.0°F annually, moderate rainfall of 37.5 inches per year, rare extreme heat with only 9.766666666666666 days above 90°F annually, moderate snowfall of 40.1 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 18.1°F. summers are warm — July averages 72.0°F. Residents experience a substantial 54°F difference between winter and summer.
Outdoor & Gardening Guidance
Winter sports enthusiasts benefit from reliable snow cover for 3-4 months annually.
Regional Context
Grant County closely matches the Wisconsin statewide average temperature of 44.4°F, it is somewhat wetter than average for Wisconsin.
Climate Profile
About Grant County Weather
Warmer Reach of the North
Grant County averages 47.0°F annually, making it one of the milder locations in Wisconsin. While still cooler than the national median, it represents the warmer, southern edge of the state's climate profile.
Above the State Average
At 47.0°F, the county is nearly 3 degrees warmer than the Wisconsin state average of 44.4°F. It is also wetter than average, receiving 37.5 inches of annual precipitation compared to the 34.5-inch state benchmark.
The Driftless Climate
Grant County receives 37.5 inches of rain and 40.1 inches of snow, a typical profile for the southwest corner. It is slightly cooler than neighboring Green County, which averages 47.3°F.
A Warm Wisconsin Summer
Summers are robust with a July average of 72.0°F and 10 days of extreme heat over 90°F. Winter remains cold but manageable, with a December through February average of 21.7°F.
Manage Humidity and Heat
Homeowners should ensure air conditioning units are serviced for the 10 annual extreme heat days. With 40 inches of snow, standard winter tires and reliable heating are still essential for the 18.1°F January lows.
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.