Washington County Climate
Washington County, Missouri
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
54.7°F
Annual Precip
45.5"
Annual Snowfall
11.5"
Extreme Heat Days
23
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6b
Minimum winter temperature range for plant survival
3,879
Supports most vegetables & fruits
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 mild, with an average annual temperature of 54.7°F, moderately wet with 45.5 inches of annual precipitation, occasional hot days — 23.2 per year above 90°F, light snow averaging 11.5 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 30.5°F. summers are warm — July averages 76.3°F. The 46°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Washington County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Washington County closely matches the Missouri statewide average temperature of 54.9°F.
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
What is the average temperature in Washington County?
How much rain does Washington County get?
Does it snow 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.