Washington County Climate
Washington County, Iowa
Avg Annual Temp
49.3°F
Annual Precip
38.1"
Annual Snowfall
29.6"
Extreme Heat Days
20.3
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Washington County Weather
Washington County's Four-Season Continental Climate
An annual average of 49.3°F places Washington County in the cooler half of the United States. The region experiences the sharp temperature swings typical of the Great Plains.
Average Temperatures with Extra Moisture
Washington's 49.3°F is slightly above the state average of 48.0°F. However, its 38.1 inches of annual precipitation makes it wetter than the 36.1-inch state norm.
Matching the Regional Temperature Profile
Washington County is slightly cooler than Warren County's 49.9°F but maintains similar precipitation patterns. It sees more snow than Van Buren County, averaging 29.6 inches per year.
Moderate Summers and Significant Snowfall
July averages 74.1°F with 20 days of extreme heat. Winter is characterized by nearly 30 inches of snow and a chilly January average of 20.8°F.
Plan for Rain and Snow
The combination of 38.1 inches of rain and 29.6 inches of snow requires robust home exterior maintenance. Waterproof boots and high-quality winter insulation are essential for the 20.8°F January lows.
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.