Knox County Climate
Knox County, Indiana
Avg Annual Temp
55.0°F
Annual Precip
46.6"
Annual Snowfall
11.8"
Extreme Heat Days
31.6
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Knox County Weather
Hot Summers in Southwest Indiana
Knox County is warmer than the national median with an annual average temperature of 55.0°F. The climate is characterized by long, hot summers and relatively short winters.
A Warm Spot on the State Map
This 55.0°F average puts the county well above the Indiana state mark of 52.2°F. It is one of the warmest agricultural hubs in the southwestern corner of the state.
More Heat than Northern Neighbors
Knox experiences more extreme heat than its neighbor Sullivan, recording 32 days above 90°F annually. Its 46.6 inches of rain exceeds the state average by nearly three inches.
Extreme Heat and Rare Snow
Summers are hot, with a July average of 76.8°F and 32 days of extreme heat. Winters are easy on shovelers, as the county receives only 11.8 inches of snow.
Plan Around Peak Summer Heat
High-capacity cooling systems are a necessity to handle the 32 days of extreme heat. Outdoor activities should be planned for the mornings to avoid peak afternoon temperatures.
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.