Climate change in Union County, Ohio
Since 1979, Union County, Ohio has warmed 2.5°F, with 1 fewer days above 90°F, 2 more nights above 70°F and 9% more precipitation a year. Its climate in 1996–2025 is most like Franklin County, IN's was in 1951–1980.
- Average temperature: +2.5°F
- Summer highs (Jun–Aug): +0.8°F
- Winter lows (Dec–Feb): +3.8°F
- Precipitation: +9%
- Wettest day of the year: −5%
- Longest dry spell: +0 days
- Days above 90°F: −1 days
- Nights above 70°F: +2 days
- Freezing nights: −15 days
- Frost-free season: +13 days
- Muggy days: +3 days
- Summer heat index (Jun–Aug): +0.8°F
- Extreme fire-weather days: +12 days
- Snowfall: −32%
- Snowy days (1 inch or more): −2 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.