Jefferson County Climate
Jefferson County, Kentucky
Avg Annual Temp
58.0°F
Annual Precip
49.4"
Annual Snowfall
10.9"
Extreme Heat Days
39.2
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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.
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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.