Jefferson County Climate
Jefferson County, Indiana
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
56.0°F
Annual Precip
48.6"
Annual Snowfall
12.1"
Extreme Heat Days
25
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6b
Minimum winter temperature range for plant survival
4,038
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Jefferson County
Climate Verdict
Jefferson County has a mild, with an average annual temperature of 56.0°F, moderately wet with 48.6 inches of annual precipitation, occasional hot days — 24.6 per year above 90°F, light snow averaging 12.1 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 33.0°F. summers are warm — July averages 77.0°F. The 44°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
The moderate temperatures support hiking, cycling, and camping comfortably in spring, summer, and fall.
Regional Context
Jefferson County is 3.6°F warmer than the Indiana statewide average of 52.4°F, it is somewhat wetter than average for Indiana.
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 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.