Waukesha County Climate
Waukesha County, Wisconsin
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
46.8°F
Annual Precip
36.2"
Annual Snowfall
38.3"
Extreme Heat Days
8
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5b
Minimum winter temperature range for plant survival
2,598
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Waukesha County
Climate Verdict
Waukesha County has a cool, averaging 46.8°F annually, moderate rainfall of 36.2 inches per year, rare extreme heat with only 8.233333333333333 days above 90°F annually, moderate snowfall of 38.3 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 19.7°F. summers are warm — July averages 71.3°F. Residents experience a substantial 52°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Waukesha County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Waukesha County closely matches the Wisconsin statewide average temperature of 44.4°F.
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 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.