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Weather & Climate in Walnut Grove CDP (Sumner County), TN
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Walnut Grove CDP (Sumner County) enjoys a temperate climate with an average annual temperature of 58°F (15°C). Winters average 37°F in January while summers reach 79°F in July. The area gets 299 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 54.4 inches (wetter than the 38-inch national average). Air quality is rated Good with a median AQI of 40. The city sits at an elevation of 885 feet.
Temperature
37°F Jan (3°C)
79°F Jul (26°C)
| Annual Average | 58.2°F |
| 8% above US avg | |
| January Average | 37°F (3°C) |
| July Average | 79°F (26°C) |
| Sunny Days | 299 days/yr |
Geography
| Elevation | 885 ft (270 m) |
| Area | 4.8 sq mi (12.5 km²) |
| Population Density | 120/sq mi |
| Coordinates | 36.4890°N, 86.6057°W |
| Timezone | America/Chicago |
| County | Sumner County County |
| Nearest Airport | Nashville International (BNA) 26 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 40.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 87.7 / 100 |
| Social Vulnerability | 14.8 / 100 |
| Community Resilience | 55.7 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Hurricane | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Moderate |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively High |
| Lightning | Relatively High |
| Ice Storm | Relatively High |
| Drought | Relatively Low |
| Cold Wave | Relatively High |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
17 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.5.
| Jun 19, 2007 | 10 km ENE of Spencer, Tennessee | M3.5 | 136 km | 1 km |
| May 30, 2023 | 6 km W of Calhoun, Kentucky | M3.0 | 133 km | 0 km |
| Nov 28, 1998 | 6 km SW of Bremen, Kentucky | M2.9 | 109 km | 0 km |
| Jan 28, 1991 | 9 km SW of Sacramento, Kentucky | M2.8 | 115 km | 1 km |
| Jan 16, 2019 | 5 km SSE of Wartrace, Tennessee | M2.8 | 115 km | 7 km |
| Feb 27, 2020 | 5 km SW of Bremen, Kentucky | M2.6 | 109 km | 27 km |
| Jul 8, 2001 | 7 km SE of Franklin, Tennessee | M2.6 | 70 km | 0 km |
| Dec 8, 1997 | 6 km NE of Murfreesboro, Tennessee | M2.6 | 72 km | 0 km |
| Mar 22, 1990 | 9 km E of Rochester, Kentucky | M2.6 | 81 km | 5 km |
| Jan 8, 1995 | Kentucky | M2.6 | 100 km | 30 km |
| Jun 1, 2019 | 4 km ESE of Manchester, Tennessee | M2.6 | 125 km | 6 km |
| Jun 3, 2023 | 7 km N of Nebo, Kentucky | M2.5 | 142 km | 16 km |
| May 30, 2023 | 7 km W of Calhoun, Kentucky | M2.5 | 133 km | 1 km |
| Mar 8, 1990 | 4 km SW of Oak Grove, Kentucky | M2.5 | 94 km | 5 km |
| May 2, 1998 | 6 km WNW of Nebo, Kentucky | M2.5 | 103 km | 9 km |
| May 20, 2002 | 9 km NNE of Beersheba Springs, Tennessee | M2.5 | 138 km | 4 km |
| Mar 2, 2014 | 18 km W of Pikeville, Tennessee | M2.5 | 148 km | 18 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
516 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 111 fatalities, 1,350 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Mar 3, 2020 | EF4 | 92 km | 8.4 mi | 19 |
| Apr 10, 2009 | EF4 | 84 km | 23.3 mi | 2 |
| Jan 24, 1997 | EF4 | 79 km | 6.5 mi | 0 |
| Dec 24, 1988 | EF4 | 69 km | 6.0 mi | 1 |
| Apr 27, 1970 | EF4 | 47 km | 42.6 mi | 3 |
| Dec 9, 2023 | EF3 | 78 km | 47.2 mi | 4 |
| Dec 11, 2021 | EF3 | 56 km | 28.0 mi | 0 |
| Dec 11, 2021 | EF3 | 48 km | 29.3 mi | 16 |
| Mar 3, 2020 | EF3 | 47 km | 60.1 mi | 5 |
| Apr 26, 2011 | EF3 | 83 km | 2.6 mi | 0 |
| Feb 6, 2008 | EF3 | 47 km | 9.4 mi | 4 |
| Feb 5, 2008 | EF3 | 27 km | 50.3 mi | 22 |
| Feb 5, 2008 | EF3 | 93 km | 18.1 mi | 3 |
| Apr 7, 2006 | EF3 | 24 km | 22.7 mi | 7 |
| Apr 7, 2006 | EF3 | 65 km | 18.8 mi | 0 |
| May 11, 2003 | EF3 | 63 km | 1.0 mi | 0 |
| May 11, 2003 | EF3 | 69 km | 1.0 mi | 0 |
| May 4, 2003 | EF3 | 67 km | 11.5 mi | 0 |
| Apr 28, 2002 | EF3 | 85 km | 3.2 mi | 0 |
| Jan 22, 1999 | EF3 | 67 km | 4.3 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
14 wildfires (100+ acres) recorded within 100 km. Largest: FLOATING MILL HOLLOW (2,422 acres, 2010).
| Year | Name | Acres Burned | Distance |
| 2010 | FLOATING MILL HOLLOW | 2,422 | 92 km |
| 2008 | BROOKS KNOB | 2,225 | 86 km |
| 2012 | FY2012 CRYSTAL CAVE BROADCAST BURN | 2,221 | 94 km |
| 2010 | JOPPA CHURCH | 2,037 | 87 km |
| 2004 | JIM LEE | 1,770 | 87 km |
| 2009 | TEMPLE HILL | 1,628 | 88 km |
| 2009 | JIM LEE | 1,613 | 88 km |
| 2007 | DEAD DEER | 1,557 | 94 km |
| 2007 | Big Woods | 1,500 | 97 km |
| 2008 | GOBLIN KNOB | 1,445 | 95 km |
| 1999 | UNNAMED | 1,039 | 92 km |
| 2007 | DENNISON FERRY RX | 655 | 95 km |
| 2000 | UNNAMED | 641 | 96 km |
| 2005 | UNNAMED | 576 | 93 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 37°F (3°C) | 3.8 in | Coldest |
| February | 39°F (4°C) | 4.1 in | |
| March | 48°F (9°C) | 5.3 in | Wettest |
| April | 57°F (14°C) | 4.3 in | |
| May | 65°F (19°C) | 5.0 in | |
| June | 73°F (23°C) | 4.3 in | |
| July | 79°F (26°C) | 4.2 in | Warmest |
| August | 76°F (25°C) | 3.5 in | |
| September | 70°F (21°C) | 3.6 in | |
| October | 59°F (15°C) | 3.0 in | Driest |
| November | 48°F (9°C) | 4.5 in | |
| December | 39°F (4°C) | 5.0 in |
Walnut Grove CDP (Sumner County) has a seasonal temperature swing of 42°F / from 37°F in January to 79°F in July. Total annual precipitation is 50.6 inches, with March being the wettest month (5.3") and October the driest (3.0").