Washington County Climate
Washington County, Ohio
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
53.3°F
Annual Precip
44.9"
Annual Snowfall
19.4"
Extreme Heat Days
19
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6b
Minimum winter temperature range for plant survival
3,468
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 53.3°F, moderately wet with 44.9 inches of annual precipitation, rare extreme heat with only 18.866666666666667 days above 90°F annually, light snow averaging 19.4 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 30.4°F. summers are warm — July averages 74.6°F. The 44°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 Ohio statewide average temperature of 51.5°F, it is somewhat wetter than average for Ohio.
Climate Profile
About Washington County Weather
Near the national temperature median
Washington County’s average temperature of 53.3°F aligns closely with the national median. It experiences a relatively mild version of the humid continental climate.
Among the warmest in Ohio
At 53.3°F, this is one of the warmest counties in the state, exceeding the Ohio average by 1.8 degrees. It is also quite wet, receiving 44.9 inches of annual precipitation.
Warmer than its inland neighbors
Washington County is warmer and wetter than Wayne and Union counties. It averages 19.4 inches of snow, which is less than Vinton County but more than Warren.
Milder winters and humid summers
Winters are relatively mild for Ohio, averaging 32.9°F from December to February. Summers bring 19 days of extreme heat, often accompanied by high humidity from the 44.9 inches of rain.
Plan for rain and humidity
Prepare for significant moisture with 44.9 inches of annual rain. Because January averages stay just above freezing at 30.4°F, residents often face cycles of freezing and thawing.
Frequently Asked Questions
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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.