Franklin County Climate
Franklin County, Ohio
Avg Annual Temp
53.2°F
Annual Precip
41.3"
Annual Snowfall
23.6"
Extreme Heat Days
18.75
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Franklin County Weather
A warm central Ohio climate
Franklin County averages 53.2°F annually, making it warmer than the national median and many surrounding regions. It features a humid continental climate with a notable urban heat island effect.
Among the state's warmest counties
At 53.2°F, Franklin County is significantly warmer than the Ohio state average of 51.5°F. It frequently records some of the highest temperatures in the central part of the state.
Leading the region in heat
Franklin is warmer than neighboring Fairfield County, which averages 52.7°F. Its 41.3 inches of annual precipitation perfectly mirrors the Ohio state average of 41.2 inches.
Frequent heat and moderate snow
Summers are hot with 19 extreme heat days above 90°F and a July average of 75.1°F. Winters bring 23.6 inches of snow, which is modest compared to the state's northern reaches.
Invest in high-efficiency cooling
With 19 days of extreme heat per year, residents should prioritize air conditioning and energy-efficient windows. Winter gear is still necessary for the 29.2°F January lows and 23.6 inches of snow.
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.