Washington County Climate
Washington County, Ohio
Avg Annual Temp
53.3°F
Annual Precip
44.9"
Annual Snowfall
19.4"
Extreme Heat Days
18.866666666666667
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.