Washington County Climate
Washington County, Wisconsin
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
45.9°F
Annual Precip
34.1"
Annual Snowfall
45.3"
Extreme Heat Days
8
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5b
Minimum winter temperature range for plant survival
2,404
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Washington County
Climate Verdict
Washington County has a cool, averaging 45.9°F annually, moderate rainfall of 34.1 inches per year, rare extreme heat with only 8.125 days above 90°F annually, moderate snowfall of 45.3 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 19.4°F. summers are warm — July averages 70.2°F. Residents experience a substantial 51°F difference between winter and summer.
Outdoor & Gardening Guidance
Winter sports enthusiasts benefit from reliable snow cover for 3-4 months annually.
Regional Context
Washington County closely matches the Wisconsin statewide average temperature of 44.4°F.
Climate Profile
About Washington County Weather
Temperate but Crisp Annual Averages
Washington County's 45.9°F annual average temperature is several degrees warmer than northern Wisconsin but remains below the national median. It serves as a middle ground between the harsh north and the milder Midwest states.
Warmer Than the State Median
At 45.9°F, Washington County is notably warmer than the 44.4°F state average. It benefits from its southeastern location, which provides slightly more growing degree days than the central plains.
Milder Winters Than Northern Peers
Washington County averages 45.3 inches of snow, which is about 10 inches less than the totals found in Washburn. Its January average of 19.4°F is significantly more tolerable than the deep freezes seen in the Northwoods.
Consistent Heat and Snow
The county sees 8 days per year reaching 90°F, twice as many as the state's northern counties. July temperatures average 70.2°F, while winter averages stay around 22.4°F.
Balance Your Seasonal Gear
With 34.1 inches of rain and 45.3 inches of snow, residents need reliable drainage and snow removal. Central air conditioning is a smart investment for the week of extreme heat each summer.
Frequently Asked Questions
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Track your own weather in Washington County
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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.