Johnson County Climate
Johnson County, Tennessee
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
53.4°F
Annual Precip
47.2"
Annual Snowfall
12.0"
Extreme Heat Days
3
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7a
Minimum winter temperature range for plant survival
3,119
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 53.4°F, moderately wet with 47.2 inches of annual precipitation, rare extreme heat with only 3.1 days above 90°F annually, light snow averaging 12.0 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 34.2°F. summers are warm — July averages 71.2°F. The 37°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Johnson County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Johnson County is 4.6°F cooler than the Tennessee statewide average of 58.0°F, it is also noticeably drier, receiving 8.5 inches less precipitation than the state average, the county experiences 33.35992831541217 fewer extreme heat days than the state average.
Climate Profile
About Johnson County Weather
Tennessee's high-altitude cool spot
Johnson County is one of the coolest spots in the South, with an annual average temperature of just 53.4°F. This matches the national median, offering a climate more similar to the Northeast than the Sun Belt.
The coldest county in Tennessee
Ranking far below the state average of 58.1°F, Johnson County’s 53.4°F average reflects its high-elevation terrain. It is a significant outlier in a state known for sweltering summer heat.
Distinctly cooler and snowier
Johnson County receives 12.0 inches of snow annually, nearly triple what most other Tennessee counties experience. It also records 47.2 inches of annual precipitation, which is lower than the state's 55.9-inch average.
Rare heat and real winters
The county sees only 3 days of 90°F weather per year, providing a unique escape from the Southern heat. Winters are the harshest in the state, with January temperatures averaging a chilly 34.2°F.
Invest in winter gear
Winter tires and reliable heating systems are essential for the foot of snow that falls annually. Air conditioning is less of a priority here compared to almost any other county in Tennessee.
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.