Washington County Climate
Washington County, Missouri
Avg Annual Temp
54.7°F
Annual Precip
45.5"
Annual Snowfall
11.5"
Extreme Heat Days
23.2
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Washington County Weather
Typical Missouri Highlands Weather
Washington County averages 54.7°F annually, sitting right at the national median. This climate is very similar to the Missouri state average of 54.9°F.
Aligning With State Norms
At 54.7°F, Washington County is almost perfectly in line with the state average. It avoids the extreme heat and cold seen at Missouri's borders.
Wetter but Cooler Summers
The county receives 45.5 inches of rain, which is more than the state average of 43.8 inches. However, it only faces 23 extreme heat days, making its summers milder than its neighbors.
Snowy Winters and Fair July
Washington sees 11.5 inches of annual snowfall, more than many southern counties. The July average stays at a comfortable 76.3°F compared to more humid regions.
Gear Up for Precipitation
With 45.5 inches of rain and 11.5 inches of snow, waterproof gear and well-maintained gutters are essential. The 23 heat days require less aggressive cooling than in southern Missouri.
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.