Union County Climate
Union County, Ohio
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
52.3°F
Annual Precip
40.5"
Annual Snowfall
24.0"
Extreme Heat Days
18
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6a
Minimum winter temperature range for plant survival
3,424
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Union County
Climate Verdict
Union County has a mild, with an average annual temperature of 52.3°F, moderately wet with 40.5 inches of annual precipitation, rare extreme heat with only 17.8 days above 90°F annually, moderate snowfall of 24.0 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 27.8°F. summers are warm — July averages 74.7°F. The 47°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Union County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Union County closely matches the Ohio statewide average temperature of 51.5°F.
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 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.