Sullivan County Climate
Sullivan County, Indiana
Avg Annual Temp
54.5°F
Annual Precip
45.6"
Annual Snowfall
15.1"
Extreme Heat Days
23.35
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Sullivan County Weather
Sullivan County's Temperate Balance
The county maintains an annual average of 54.5°F, which is warmer than the national median. It experiences a robust four-season climate typical of the Ohio Valley.
Exceeding the State Temperature Average
Sullivan's 54.5°F average is over two degrees higher than the Indiana state average of 52.2°F. It is part of the warmer southwestern quadrant of the state.
Matching the Southern Indiana Gradient
Sullivan mirrors the climate of Scott County almost exactly. It is significantly warmer and less snowy than northern counties like St. Joseph.
Hot July Peaks and Moderate Snow
July averages 76.3°F with 23 days of extreme heat above 90°F. Winters are manageable with 15.1 inches of snow and a January average of 29.4°F.
Balance Your Seasonal Home Prep
Ensure your HVAC system is ready for 23 days of extreme heat and 15 inches of winter snow. Check your home's drainage to handle the 45.6 inches of annual precipitation.
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.