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Weather & Climate in Summertown, TN
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Summertown enjoys a temperate climate with an average annual temperature of 59°F (15°C). Winters average 38°F in January while summers reach 78°F in July. The area gets 318 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Air quality is rated Good with a median AQI of 40. The city sits at an elevation of 1,012 feet.
Temperature
38°F Jan (4°C)
78°F Jul (25°C)
| Annual Average | 58.8°F |
| 9% above US avg | |
| January Average | 38°F (4°C) |
| July Average | 78°F (25°C) |
| Sunny Days | 318 days/yr |
Geography
| Elevation | 1,012 ft (308 m) |
| Area | 2.0 sq mi (5.2 km²) |
| Population Density | 395/sq mi |
| Coordinates | 35.4344°N, 87.3085°W |
| Timezone | America/Chicago |
| County | Lewis County County |
| Nearest Airport | Maury County Regional (MRC) 11 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 40.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 13.9 / 100 |
| Social Vulnerability | 44.6 / 100 |
| Community Resilience | 12.4 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Very Low |
| Strong Wind | Relatively Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Low |
| Drought | Very Low |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
29 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.9.
| Dec 8, 2001 | 5 km SW of Pleasant Groves, Alabama | M3.9 | 127 km | 0 km |
| May 10, 2020 | 7 km SSE of Sewanee, Tennessee | M3.1 | 133 km | 8 km |
| May 4, 1994 | 12 km NNW of Addison, Alabama | M3.0 | 126 km | 5 km |
| May 4, 1994 | 2 km NNW of Addison, Alabama | M3.0 | 135 km | 19 km |
| Jan 2, 2000 | 4 km SW of Lester, Alabama | M2.9 | 54 km | 10 km |
| Jan 2, 2000 | 4 km SW of Lester, Alabama | M2.9 | 54 km | 13 km |
| Sep 20, 1990 | 6 km N of Elkmont, Alabama | M2.8 | 59 km | 4 km |
| May 13, 1999 | 11 km S of Pulaski, Tennessee | M2.8 | 46 km | 20 km |
| May 13, 1999 | 7 km NW of Elkmont, Alabama | M2.8 | 56 km | 10 km |
| May 10, 2020 | 7 km SSE of Sewanee, Tennessee | M2.8 | 133 km | 6 km |
| Jan 16, 2019 | 5 km SSE of Wartrace, Tennessee | M2.8 | 91 km | 7 km |
| Oct 20, 2017 | 5 km ENE of Hollywood, Alabama | M2.7 | 148 km | 5 km |
| Mar 11, 2006 | 17 km E of Olivet, Tennessee | M2.7 | 69 km | 2 km |
| Mar 11, 2017 | 6 km SW of Trinity, Alabama | M2.7 | 97 km | 5 km |
| Aug 13, 2022 | 6 km NW of Hazel Green, Alabama | M2.7 | 81 km | 13 km |
| Jan 15, 2016 | 8 km ENE of Natural Bridge, Alabama | M2.6 | 147 km | 5 km |
| Jul 31, 1999 | 3 km SSW of Moulton, Alabama | M2.6 | 110 km | 0 km |
| Jul 31, 1999 | 5 km SW of Moulton, Alabama | M2.6 | 110 km | 0 km |
| Jul 8, 2001 | 7 km SE of Franklin, Tennessee | M2.6 | 67 km | 0 km |
| Sep 9, 2000 | 10 km NNW of Kimball, Tennessee | M2.6 | 147 km | 6 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
557 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 87 fatalities, 1,627 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Apr 16, 1998 | EF5 | 69 km | 69.4 mi | 3 |
| Apr 3, 1974 | EF5 | 85 km | 83.3 mi | 16 |
| Apr 10, 2009 | EF4 | 55 km | 23.3 mi | 2 |
| Feb 5, 2008 | EF4 | 91 km | 16.2 mi | 3 |
| May 5, 1999 | EF4 | 57 km | 6.0 mi | 3 |
| Jan 24, 1997 | EF4 | 83 km | 6.5 mi | 0 |
| May 18, 1995 | EF4 | 51 km | 29.0 mi | 3 |
| May 18, 1995 | EF4 | 72 km | 39.0 mi | 1 |
| Dec 24, 1988 | EF4 | 65 km | 6.0 mi | 1 |
| Apr 3, 1974 | EF4 | 88 km | 27.5 mi | 11 |
| Mar 22, 1952 | EF4 | 97 km | 21.6 mi | 4 |
| Feb 29, 1952 | EF4 | 73 km | 2.0 mi | 2 |
| Feb 13, 1952 | EF4 | 95 km | 12.7 mi | 3 |
| May 8, 2024 | EF3 | 78 km | 3.8 mi | 0 |
| May 8, 2024 | EF3 | 34 km | 11.5 mi | 1 |
| Apr 1, 2023 | EF3 | 84 km | 12.0 mi | 1 |
| Mar 3, 2020 | EF3 | 88 km | 60.1 mi | 5 |
| Dec 23, 2015 | EF3 | 68 km | 48.4 mi | 0 |
| Apr 28, 2014 | EF3 | 84 km | 26.8 mi | 2 |
| Apr 28, 2014 | EF3 | 74 km | 15.6 mi | 2 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
5 wildfires (100+ acres) recorded within 100 km. Largest: ROCKHOUSE ROAD (791 acres, 2007).
| Year | Name | Acres Burned | Distance |
| 2007 | ROCKHOUSE ROAD | 791 | 41 km |
| 2000 | UNNAMED | 762 | 72 km |
| 1999 | UNNAMED | 564 | 31 km |
| 1996 | UNNAMED | 523 | 46 km |
| 2014 | MERIWETHER LEWIS | 513 | 16 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 38°F (4°C) | 4.6 in | Coldest |
| February | 41°F (5°C) | 4.6 in | |
| March | 49°F (10°C) | 6.2 in | Wettest |
| April | 57°F (14°C) | 5.0 in | |
| May | 65°F (18°C) | 5.6 in | |
| June | 73°F (23°C) | 3.8 in | |
| July | 78°F (25°C) | 4.8 in | Warmest |
| August | 76°F (24°C) | 3.6 in | Driest |
| September | 70°F (21°C) | 3.9 in | |
| October | 59°F (15°C) | 3.6 in | |
| November | 49°F (9°C) | 5.1 in | |
| December | 41°F (5°C) | 5.5 in |
Summertown has a seasonal temperature swing of 39°F / from 38°F in January to 78°F in July. Total annual precipitation is 56.1 inches, with March being the wettest month (6.2") and August the driest (3.6").