Johnson County Climate
Johnson County, Kentucky
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
55.3°F
Annual Precip
46.2"
Annual Snowfall
—
Extreme Heat Days
25
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7a
Minimum winter temperature range for plant survival
3,772
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Johnson County
Climate Verdict
Johnson County has a mild, with an average annual temperature of 55.3°F, moderately wet with 46.2 inches of annual precipitation, occasional hot days — 24.5 per year above 90°F. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 33.5°F. summers are warm — July averages 75.4°F. The 42°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
Johnson County closely matches the Kentucky statewide average temperature of 56.0°F, it is somewhat drier than average for Kentucky.
Climate Profile
About Johnson County Weather
Typical American temperate conditions
Johnson County’s average annual temperature of 55.3°F aligns closely with the national median. This mountainous region experiences a humid subtropical climate with slightly moderated summer peaks.
Cooler and drier than the state
The county stays cooler than the Kentucky average of 56.2°F and is notably drier, with only 46.2 inches of rain. This makes it one of the less precipitous areas in the state compared to the 50.6-inch average.
Cooler than its southern neighbor Knox
Johnson County is slightly cooler than Knox County, which averages 56.0°F. It also experiences fewer extreme heat days, with 25 days over 90°F compared to Knox's 29 days.
Moderate summers and cold winters
July temperatures average a comfortable 75.4°F, though the county still sees 25 days of extreme heat. Winters are chilly, with January averaging 33.5°F and a seasonal average of 36.1°F.
Adaptable clothing for variable temps
The 25 days of extreme heat require efficient cooling, but the lower-than-average rainfall of 46.2 inches means fewer soggy days. Winter preparation should focus on the January freeze when temps hover around 33.5°F.
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.