Knox County Climate
Knox County, Indiana
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
55.0°F
Annual Precip
46.6"
Annual Snowfall
11.8"
Extreme Heat Days
32
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6b
Minimum winter temperature range for plant survival
3,991
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Knox County
Climate Verdict
Knox County has a mild, with an average annual temperature of 55.0°F, moderately wet with 46.6 inches of annual precipitation, occasional hot days — 31.6 per year above 90°F, light snow averaging 11.8 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 30.2°F. summers are warm — July averages 76.8°F. The 47°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Knox County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Knox County closely matches the Indiana statewide average temperature of 52.4°F, it is somewhat wetter than average for Indiana.
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 sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.