Williamson County Climate
Williamson County, Tennessee
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
59.0°F
Annual Precip
55.3"
Annual Snowfall
2.6"
Extreme Heat Days
48
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7b
Minimum winter temperature range for plant survival
4,630
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Williamson County
Climate Verdict
Williamson County has a mild, with an average annual temperature of 59.0°F, very wet conditions receiving 55.3 inches of precipitation annually, occasional hot days — 48.300000000000004 per year above 90°F, light snow averaging 2.6 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 37.8°F. summers are warm — July averages 78.9°F. The 41°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
Williamson County closely matches the Tennessee statewide average temperature of 58.0°F.
Climate Profile
About Williamson County Weather
Warm and Growing Seasons
Williamson County’s 59.0°F annual average is much higher than the national median. This warmth supports a long growing season and a characteristic Southern climate.
Among Tennessee's Warmer Counties
At 59.0°F, Williamson is nearly a full degree warmer than the state average of 58.1°F. It ranks as one of the warmer urban-adjacent counties in the state.
Warmer Than Surrounding Rural Areas
Williamson is warmer than Trousdale (57.9°F) and White County (58.0°F). Its climate is more consistent with the lower-elevation basins of Middle Tennessee.
Significant Summer Heat Peaks
The county sees 48 days of temperatures reaching 90°F or higher, with a July average of 78.9°F. Winters are mild with only 2.6 inches of annual snowfall.
Focus on Summer Electricity Costs
The 48 days of extreme heat mean air conditioning units will work overtime for nearly two months of the year. Minimal snowfall of 2.6 inches means winter road prep is only occasionally necessary.
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.