Defiance County Climate
Defiance County, Ohio
Avg Annual Temp
50.2°F
Annual Precip
35.3"
Annual Snowfall
24.2"
Extreme Heat Days
18.3
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.