Hamilton County Climate
Hamilton County, Tennessee
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
59.1°F
Annual Precip
58.9"
Annual Snowfall
4.0"
Extreme Heat Days
27
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
8a
Minimum winter temperature range for plant survival
4,522
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Hamilton County
Climate Verdict
Hamilton County has a mild, with an average annual temperature of 59.1°F, very wet conditions receiving 58.9 inches of precipitation annually, occasional hot days — 27.3 per year above 90°F, light snow averaging 4.0 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 39.0°F. summers are warm — July averages 77.7°F. The 39°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
Hamilton County closely matches the Tennessee statewide average temperature of 58.0°F, it is somewhat wetter than average for Tennessee.
Climate Profile
About Hamilton County Weather
Warm Valley with High Humidity
Hamilton County's average temperature of 59.1°F is significantly higher than the national median. The region is very wet, receiving 58.9 inches of annual precipitation.
Warmer than the State Average
Hamilton stays a full degree warmer than the Tennessee average of 58.1°F. Its location in the southern Tennessee River valley traps heat more effectively than northern neighbors.
Much Warmer than Plateau Neighbors
At 59.1°F, Hamilton is over 4 degrees warmer than Grundy County. It shares a similar high-precipitation profile with Franklin County, both averaging around 60 inches of rain.
Hot Summers and Light Snow
Residents face 27 days of extreme heat over 90°F each year. Winter is mild with only 4 inches of annual snow and January lows averaging a manageable 39°F.
Invest in High-Efficiency Cooling
With a summer average of 76.2°F and frequent 90-degree days, AC systems will work hard here. Keep umbrellas handy year-round to manage the nearly 59 inches of rainfall.
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.