Climate change in Union County, Indiana
Since 1979, Union County, Indiana has warmed 2.3°F, with 2 fewer days above 90°F, 1 more nights above 70°F and 10% more precipitation a year. Its climate in 1996–2025 is most like Dearborn County, IN's was in 1951–1980.
- Average temperature: +2.3°F
- Summer highs (Jun–Aug): +0.3°F
- Winter lows (Dec–Feb): +3.5°F
- Precipitation: +10%
- Wettest day of the year: +26%
- Longest dry spell: −1 days
- Days above 90°F: −2 days
- Nights above 70°F: +1 days
- Freezing nights: −12 days
- Frost-free season: +13 days
- Muggy days: +5 days
- Summer heat index (Jun–Aug): +0.3°F
- Extreme fire-weather days: +17 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.