Defiance County Climate
Defiance County, Ohio
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
50.2°F
Annual Precip
35.3"
Annual Snowfall
24.2"
Extreme Heat Days
18
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6a
Minimum winter temperature range for plant survival
3,062
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Defiance County
Climate Verdict
Defiance County has a mild, with an average annual temperature of 50.2°F, moderate rainfall of 35.3 inches per year, rare extreme heat with only 18.3 days above 90°F annually, moderate snowfall of 24.2 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 25.1°F. summers are warm — July averages 73.3°F. The 48°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Defiance County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Defiance County closely matches the Ohio statewide average temperature of 51.5°F, it is also noticeably drier, receiving 6.0 inches less precipitation than the state average.
Climate Profile
About Defiance County Weather
A cooler pocket in the Midwest
Defiance County records an annual average temperature of 50.2°F, which is cooler than the national median. This northern climate is characterized by shorter growing seasons and crisper air.
Among the cooler Ohio counties
The county's 50.2°F average is significantly lower than the Ohio state average of 51.5°F. It ranks as one of the colder regions in the state, particularly during the winter months.
Drier than the state average
Defiance County receives only 35.3 inches of annual precipitation, well below the state average of 41.2 inches. It is slightly warmer than neighboring Fulton County, which averages 49.2°F.
Cold winters and sharp heat
Winters are harsh with an average of 27.8°F, though snowfall is moderate at 24.2 inches. Despite the cool average, the county experiences a surprising 18 extreme heat days per year.
Prepare for temperature extremes
Homes require robust heating for the 25.1°F January average and cooling for 18 days of 90°F weather. Outdoor planning should account for the lower-than-average 35.3 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.