McNairy County Climate
McNairy County, Tennessee
Avg Annual Temp
60.4°F
Annual Precip
59.1"
Annual Snowfall
1.0"
Extreme Heat Days
59.1
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.