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Weather & Climate in Decatur, TN

Temperature, precipitation, air quality, natural hazards, and monthly weather data.

Decatur enjoys a temperate climate with an average annual temperature of 58°F (15°C). Winters average 38°F in January while summers reach 78°F in July. The area gets 301 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 57.6 inches (wetter than the 38-inch national average). The area receives 3.3 inches of snow annually. Air quality is rated Good with a median AQI of 40. The city sits at an elevation of 898 feet.

Temperature

38°F Jan (3°C) 78°F Jul (26°C)
Annual Average58.4°F
8% above US avg
January Average38°F (3°C)
July Average78°F (26°C)
Sunny Days301 days/yr

Geography

Elevation898 ft (274 m)
Area3.0 sq mi (7.8 km²)
Population Density489/sq mi
Coordinates35.5291°N, 84.7933°W
TimezoneAmerica/Chicago
CountyMeigs County County
Nearest AirportMc Ghee Tyson (TYS)
49 miles away

Precipitation & Snow

Annual Rainfall 57.6"
52% above US avg
Snowfall 3.3"
Wettest Month (Mar) 6.10"
Driest Month (Oct) 3.50"

Air Quality

AQI Median40.0
RatingGood

Natural Hazard Risk

Overall RiskVery Low
Risk Score12.7 / 100
Social Vulnerability77.8 / 100
Community Resilience35.4 / 100

Hazard Breakdown

Tornado Relatively Low
Hurricane Very Low
Earthquake Relatively Low
Wildfire Very Low
Flood Very Low
Hail Very Low
Strong Wind Relatively Moderate
Heat Wave Very Low
Winter Weather Very Low
Lightning Relatively Low
Ice Storm Very Low
Drought Relatively Low
Cold Wave Relatively Low
Landslide Relatively Low
Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

197 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.6.

Apr 29, 2003 8 km S of Valley Head, Alabama M4.6 138 km 20 km
May 10, 2025 21 km SE of Greenback, Tennessee M4.1 73 km 25 km
Jan 20, 2020 2 km NE of Fincastle, Tennessee M3.8 122 km 35 km
Jul 5, 1995 12 km ESE of Tellico Plains, Tennessee M3.7 61 km 10 km
Jun 17, 1998 9 km SSE of Coalfield, Tennessee M3.6 59 km 11 km
Jun 19, 2007 10 km ENE of Spencer, Tennessee M3.5 59 km 1 km
Jul 19, 1997 12 km E of Cohutta, Georgia M3.5 64 km 3 km
Jun 16, 2006 9 km W of Maggie Valley, North Carolina M3.4 144 km 1 km
Mar 5, 2019 7 km NE of Maynardville, Tennessee M3.4 128 km 17 km
Mar 18, 1995 10 km SE of Dayton, Tennessee M3.3 18 km 26 km
Aug 31, 2009 2 km NNE of Friendsville, Tennessee M3.3 67 km 14 km
Apr 20, 2010 4 km SW of Maryville, Tennessee M3.3 75 km 2 km
Apr 11, 2006 5 km NE of Etowah, Tennessee M3.3 34 km 20 km
Mar 21, 2001 7 km ESE of Trenton, Georgia M3.2 96 km 0 km
Aug 1, 2009 8 km ENE of Ducktown, Tennessee M3.2 69 km 5 km
Jul 26, 2001 11 km N of Sevierville, Tennessee M3.2 122 km 14 km
Jul 26, 2001 11 km S of New Market, Tennessee M3.2 124 km 17 km
Mar 7, 2001 6 km NW of Decatur, Tennessee M3.2 6 km 7 km
May 10, 2006 3 km WNW of Madisonville, Tennessee M3.2 36 km 25 km
Apr 5, 1994 10 km N of Trenton, Georgia M3.2 89 km 24 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

334 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 95 fatalities, 1,376 injuries.

Date Rating Distance Path Fatalities
Apr 27, 2011 EF4 61 km 40.2 mi 4
Apr 27, 2011 EF4 67 km 14.5 mi 0
Apr 27, 2011 EF4 81 km 48.0 mi 20
Apr 3, 1974 EF4 90 km 28.4 mi 10
Apr 3, 1974 EF4 78 km 24.0 mi 4
Apr 3, 1974 EF4 84 km 18.8 mi 7
May 2, 1953 EF4 2 km 4.2 mi 4
Apr 12, 2020 EF3 78 km 19.3 mi 2
Nov 30, 2016 EF3 47 km 4.6 mi 2
Mar 2, 2012 EF3 56 km 41.0 mi 0
Mar 23, 2011 EF3 53 km 5.8 mi 0
Nov 10, 2002 EF3 50 km 12.2 mi 4
Nov 10, 2002 EF3 58 km 8.3 mi 7
Mar 29, 1997 EF3 43 km 4.0 mi 0
Mar 29, 1997 EF3 72 km 8.0 mi 0
May 18, 1995 EF3 48 km 9.0 mi 0
Apr 15, 1994 EF3 30 km 15.0 mi 1
Feb 21, 1993 EF3 73 km 16.0 mi 0
Feb 21, 1993 EF3 48 km 30.0 mi 1
Feb 21, 1993 EF3 29 km 19.0 mi 0
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: ROUGH RIDGE (27,610 acres, 2016).

Year Name Acres Burned Distance
2016 ROUGH RIDGE 27,610 71 km
1987 UNNAMED 11,663 86 km
2024 RX - T26 BRUSHY RIDGE 8,324 65 km
2000 UNNAMED 8,064 95 km
2016 MAPLE SPRINGS 7,696 80 km
2000 UNNAMED 5,371 81 km
2024 RX - T10 MILLER RIDGE 5,154 61 km
2003 UNNAMED 4,675 44 km
2001 UNNAMED 4,635 99 km
2024 RX - O63 CHESTNUT MTN 4,570 61 km
2013 BEAVER DAM 4,336 68 km
2001 UNNAMED 4,213 68 km
2021 UNNAMED 3,888 61 km
1987 UNNAMED 3,854 100 km
2021 DUTCH CREEK 3,845 57 km
2019 COW CAMP 3,786 67 km
2000 UNNAMED 3,539 34 km
2016 WHITE OAK CIRCLE 3,182 80 km
2019 JACK DAVIS/DOGWOOD SPRINGS RX 3,120 79 km
2016 SR116-DEVONIA 3,077 74 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 38°F (3°C) 5.1 in Coldest
February 41°F (5°C) 4.7 in
March 49°F (10°C) 6.1 in Wettest
April 57°F (14°C) 4.5 in
May 65°F (19°C) 5.0 in
June 73°F (23°C) 3.9 in
July 78°F (26°C) 5.1 in Warmest
August 76°F (25°C) 3.9 in
September 70°F (21°C) 4.1 in
October 59°F (15°C) 3.5 in Driest
November 49°F (9°C) 4.8 in
December 41°F (5°C) 5.6 in

Decatur has a seasonal temperature swing of 40°F / from 38°F in January to 78°F in July. Total annual precipitation is 56.2 inches, with March being the wettest month (6.1") and October the driest (3.5").

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