Jefferson County Climate
Jefferson County, Indiana
Avg Annual Temp
56.0°F
Annual Precip
48.6"
Annual Snowfall
12.1"
Extreme Heat Days
24.6
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Jefferson County Weather
Warm Subtropical Influence in Jefferson
With an annual average of 56.0°F, Jefferson County is warmer than the national median. This region leans toward a humid subtropical influence, featuring milder winters than the northern U.S.
One of Indiana's Warmest Counties
Jefferson is significantly warmer than the 52.2°F Indiana state average. It ranks as one of the warmest counties in the entire state due to its southern location.
High Precipitation Along the Ohio River
It experiences a climate similar to Clark and Scott counties along the Ohio River corridor. The county is much wetter than its northern counterparts, receiving 48.6 inches of precipitation annually.
Hot Summers and Very Little Snow
Summers are intense with 25 days of extreme heat and a July average of 77.0°F. Conversely, winters are mild with only 12.1 inches of snow and a 35.5°F winter average.
Focus on Summer Cooling Systems
Residents need robust air conditioning systems to navigate the 25 days of extreme summer heat. Heavy winter gear is less critical here than in northern Indiana, given the light snowfall.
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.