TODAY DEC22
TEMPERATURE23
HUMIDITY86
PRESSURE103050
WIND COND.40 5.4
  • 4827Mon
  • 5233Tue
  • 524130%20%
  • 5743Thu
  • 6046Fri40%50%
daynightWeather update from Athens McMinn County Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Decatur for July is 74.6 degrees
  • The lowest monthly average temperature in Decatur for January is 36.3 degrees
  • The most monthly precipitation in Decatur occurs in July with 6.8 inches
  • The air quality index in Decatur is 29% better than the national average
  • The pollution index in Decatur is 166% worse than the national average

Compare Decatur, TN Weather

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      Decatur Average Temperature

      In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
      MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
      January28°F46°F36°F4.7"
      February31°F50°F40°F4.6"
      March39°F60°F49°F5.7"
      April48°F71°F59°F5.8"
      May55°F76°F65°F4.4"
      June62°F82°F72°F5.0"
      July66°F84°F75°F6.8"
      August65°F84°F74°F3.8"
      September58°F79°F68°F4.1"
      October47°F70°F58°F3.6"
      November38°F59°F48°F4.8"
      December33°F50°F41°F6.4"

      Decatur air quality index & pollution index

      In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
      IndexDecaturTennesseeNational
      Air quality index307642
      Pollution index7,263,2202,454,9162,726,193

      Decatur air quality

      MeasurementTotal
      Days measured357
      Days with good air quality316
      Days with moderate air quality41
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.240%
      Benzene0.020%
      Carbon Tetrachloride0.003%
      Lead0.080%
      Mercury0.300%

      Average monthly Decatur temperature with heat index

      Decatur monthly precipitation with daily maximum

      Decatur monthly snow depth with daily maximum

      Decatur monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Dayton, TN7,357198.0%
      Riceville, TN7713040.0%
      Athens, TN13,9313040.0%
      Spring City, TN2,2423040.0%
      Etowah, TN3,5053040.0%
      Decatur, TN1,6123040.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Saint-François-de-la-Rivière-du-Sud, QC1,612n/a 
      Pine Valley, CA1,6116428.0%
      New Buffalo, MI1,6133726.0%
      Nescopeck, PA1,6133824.0%
      Shiremanstown, PA1,6114412.0%
      Decatur, TN1,6123040.0%
      Source: The Decatur, TN weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.