Union County Climate
Union County, Ohio
Avg Annual Temp
52.3°F
Annual Precip
40.5"
Annual Snowfall
24.0"
Extreme Heat Days
17.8
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Union County Weather
Typical Midwestern temperature patterns
Union County’s 52.3°F average temperature is just slightly below the national median. It enjoys a balanced climate with significant seasonal shifts in both temperature and precipitation.
Warmer than the Ohio average
Union County stays warmer than the state average of 51.5°F, recording an average of 52.3°F. It is slightly drier than the rest of the state, receiving 40.5 inches of precipitation.
Warmer than western neighbor Van Wert
Union County is more than a degree warmer than Van Wert County, which averages 51.0°F. It also receives more annual snowfall, recording 24.0 inches compared to Van Wert's 17.1 inches.
Hot summers and moderate winters
The county experiences 18 days of heat over 90°F, contributing to a warm 73.0°F summer average. Winters are cold but manageable, with 24.0 inches of snow and a 30.5°F winter average.
Prepare for variable winter precipitation
Homeowners should prepare for 24.0 inches of snow while ensuring HVAC systems can handle 18 days of extreme heat. Rain gear is also helpful for the 40.5 inches of annual rainfall.
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.