Grant County Climate
Grant County, Wisconsin
Avg Annual Temp
47.0°F
Annual Precip
37.5"
Annual Snowfall
40.1"
Extreme Heat Days
9.766666666666666
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.