Jefferson County Climate
Jefferson County, Kentucky
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
57.9°F
Annual Precip
49.4"
Annual Snowfall
10.9"
Extreme Heat Days
39
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7a
Minimum winter temperature range for plant survival
4,516
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 57.9°F, moderately wet with 49.4 inches of annual precipitation, occasional hot days — 39.2 per year above 90°F, light snow averaging 10.9 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 34.9°F. summers are warm — July averages 78.8°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 closely matches the Kentucky statewide average temperature of 56.0°F.
Climate Profile
About Jefferson County Weather
A warm, humid urban climate
Jefferson County's annual average temperature of 57.9°F is notably warmer than the national median. The humid subtropical environment is often influenced by an urban heat island effect within the Louisville metro area.
Warm and wet relative to Kentucky
The county is warmer than the state average of 56.2°F, though its 49.4 inches of rain falls just below the state average. This makes it a relatively warm hub within the Commonwealth.
Snowier than its western neighbors
Jefferson County receives 10.9 inches of annual snowfall, which is significantly higher than Henderson County's 6.5 inches. Its temperature profile is also slightly cooler than the extreme heat found in Hopkins County.
Hot summers and snowy spells
July brings an average of 78.8°F and contributes to 39 days of extreme heat per year. Winter features a January average of 34.9°F and the highest snowfall on this list at 10.9 inches.
Winter prep and summer cooling
A sturdy snow shovel and salt are necessary for the nearly 11 inches of annual snow. High electricity bills are likely in July when 39 days of heat over 90°F stress local power grids.
Frequently Asked Questions
What is the average temperature in Jefferson County?
How much rain does Jefferson County get?
Does it snow in Jefferson County?
How hot does Jefferson County get in summer?
How cold are winters in Jefferson County?
Track your own weather in Jefferson County
Ambient Weather personal weather stations give you hyperlocal climate data.
Sponsored
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.