Waukesha County Climate
Waukesha County, Wisconsin
Avg Annual Temp
46.8°F
Annual Precip
36.2"
Annual Snowfall
38.3"
Extreme Heat Days
8.233333333333333
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Waukesha County Weather
One of Wisconsin's Warmest Spots
Waukesha’s 46.8°F average annual temperature is one of the highest in the state, though it still trails the national median. This area represents the warmer edge of the humid continental climate zone.
Beating the State Average
Waukesha is roughly 2.4 degrees warmer than the Wisconsin state average of 44.4°F. This makes it one of the most temperate counties in a state known for its cold extremes.
The Dry, Warm Choice
Compared to nearby Wood County, Waukesha receives about 14 inches less snow annually. Its 38.3-inch snow total is the lowest among this specific group of Wisconsin counties.
Hot Summers and Manageable Cold
July averages 71.3°F with 8 days of extreme heat peaking above 90°F. Winter is relatively mild for the state, with a seasonal average of 22.9°F.
Focus on Summer Comfort
Because snowfall is lower here than in much of the state, focus resources on HVAC efficiency for the 8 annual heat-wave days. Reliable rain gear is necessary to handle the 36.2 inches of annual precipitation.
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.