McNairy County Climate
McNairy County, Tennessee
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
60.4°F
Annual Precip
59.1"
Annual Snowfall
1.0"
Extreme Heat Days
59
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7b
Minimum winter temperature range for plant survival
4,964
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: McNairy County
Climate Verdict
McNairy County has a warm, averaging 60.4°F year-round, very wet conditions receiving 59.1 inches of precipitation annually, occasional hot days — 59.1 per year above 90°F, light snow averaging 1.0 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 39.3°F. summers are warm — July averages 79.8°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
McNairy County closely matches the Tennessee statewide average temperature of 58.0°F, it is somewhat wetter than average for Tennessee, the county experiences 22.64007168458783 more extreme heat days than the state average.
Climate Profile
About McNairy County Weather
A Warm Subtropical Climate in West Tennessee
McNairy County averages 60.4°F annually, making it significantly warmer than the national median of 55°F. This humid subtropical climate is characterized by mild winters and long, humid summers.
Warmer Than the Tennessee Average
The county's average temperature of 60.4°F sits well above the Tennessee state average of 58.1°F. This makes McNairy one of the warmer counties in the state, driven by its southern latitude and lower elevation.
Wetter and Warmer than Regional Neighbors
With 59.1 inches of annual rainfall, McNairy is considerably wetter than the state average of 55.9 inches. It maintains higher heat levels than northern neighbors like Obion County, which averages only 57.8°F.
Intense Summer Heat and Minimal Snow
Residents face 59 extreme heat days per year where temperatures top 90°F. Conversely, winter is mild with a January average of 39.3°F and only 1.0 inch of annual snowfall.
Prioritize High-Efficiency Cooling and Drainage
Homeowners should invest in robust HVAC systems to handle two months of extreme heat. Given the high annual precipitation of 59.1 inches, proper gutter maintenance and yard drainage are essential.
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.