Climate change in Sullivan County, Indiana
Since 1979, Sullivan County, Indiana has warmed 3.1°F, with 7 more days above 90°F, 8 more nights above 70°F and 6% more precipitation a year. Its climate in 1996–2025 is most like Wabash County, IL's was in 1951–1980.
- Average temperature: +3.1°F
- Summer highs (Jun–Aug): +1.4°F
- Winter lows (Dec–Feb): +4.0°F
- Precipitation: +6%
- Wettest day of the year: +10%
- Longest dry spell: +1 days
- Days above 90°F: +7 days
- Nights above 70°F: +8 days
- Freezing nights: −15 days
- Frost-free season: +17 days
- Muggy days: +4 days
- Summer heat index (Jun–Aug): +2.6°F
- Extreme fire-weather days: +17 days
- Snowfall: −54%
- Snowy days (1 inch or more): −7 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.