Washington County Climate
Washington County, Wisconsin
Avg Annual Temp
45.9°F
Annual Precip
34.1"
Annual Snowfall
45.3"
Extreme Heat Days
8.125
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.