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Weather & Climate in Walnut Grove CDP (Hardin County), TN
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Walnut Grove CDP (Hardin County) enjoys a temperate climate with an average annual temperature of 62°F (16°C). Winters average 41°F in January while summers reach 81°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 59.2 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 724 feet.
Temperature
41°F Jan (5°C)
81°F Jul (27°C)
| Annual Average | 61.5°F |
| 14% above US avg | |
| January Average | 41°F (5°C) |
| July Average | 81°F (27°C) |
| Sunny Days | 301 days/yr |
Geography
| Elevation | 724 ft (221 m) |
| Area | 5.8 sq mi (14.9 km²) |
| Population Density | 81/sq mi |
| Coordinates | 35.0479°N, 88.0641°W |
| Timezone | America/Chicago |
| County | Hardin County County |
| Nearest Airport | Northwest Alabama Regional (MSL) 33 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 40.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 70.7 / 100 |
| Social Vulnerability | 88.8 / 100 |
| Community Resilience | 41.5 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively Low |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Low |
| Winter Weather | Very Low |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Low |
| Drought | Relatively Low |
| Cold Wave | Relatively High |
| Landslide | Relatively High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
28 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.2.
| Jun 23, 1990 | 12 km E of Vernon, Alabama | M3.2 | 143 km | 1 km |
| Sep 2, 1990 | 12 km NW of Fayette, Alabama | M3.2 | 144 km | 1 km |
| May 10, 2008 | 1 km SSE of Sherman, Mississippi | M3.1 | 105 km | 0 km |
| Nov 6, 1994 | 11 km WSW of Trenton, Tennessee | M3.1 | 135 km | 11 km |
| Jun 23, 1990 | 8 km N of Belk, Alabama | M3.1 | 148 km | 6 km |
| May 4, 1994 | 12 km NNW of Addison, Alabama | M3.0 | 112 km | 5 km |
| May 4, 1994 | 2 km NNW of Addison, Alabama | M3.0 | 122 km | 19 km |
| May 28, 2000 | 13 km S of Winfield, Alabama | M3.0 | 140 km | 5 km |
| Jan 2, 2000 | 4 km SW of Lester, Alabama | M2.9 | 81 km | 10 km |
| Jan 2, 2000 | 4 km SW of Lester, Alabama | M2.9 | 81 km | 13 km |
| May 13, 1999 | 11 km S of Pulaski, Tennessee | M2.8 | 94 km | 20 km |
| May 13, 1999 | 7 km NW of Elkmont, Alabama | M2.8 | 94 km | 10 km |
| Sep 20, 1990 | 6 km N of Elkmont, Alabama | M2.8 | 101 km | 4 km |
| Mar 11, 2006 | 17 km E of Olivet, Tennessee | M2.7 | 17 km | 2 km |
| Mar 11, 2017 | 6 km SW of Trinity, Alabama | M2.7 | 99 km | 5 km |
| Aug 13, 2022 | 6 km NW of Hazel Green, Alabama | M2.7 | 132 km | 13 km |
| Jan 15, 2016 | 8 km ENE of Natural Bridge, Alabama | M2.6 | 114 km | 5 km |
| Feb 10, 2002 | 5 km NNE of Glen Allen, Alabama | M2.6 | 125 km | 4 km |
| Jul 31, 1999 | 3 km SSW of Moulton, Alabama | M2.6 | 96 km | 0 km |
| Jul 31, 1999 | 5 km SW of Moulton, Alabama | M2.6 | 95 km | 0 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
478 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 122 fatalities, 1,259 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Apr 16, 1998 | EF5 | 20 km | 69.4 mi | 3 |
| Apr 3, 1974 | EF5 | 84 km | 52.0 mi | 28 |
| Feb 5, 2008 | EF4 | 32 km | 16.2 mi | 3 |
| May 5, 1999 | EF4 | 60 km | 6.0 mi | 3 |
| Jan 17, 1999 | EF4 | 95 km | 16.0 mi | 6 |
| May 18, 1995 | EF4 | 97 km | 39.0 mi | 1 |
| May 18, 1995 | EF4 | 54 km | 29.0 mi | 3 |
| Apr 19, 1970 | EF4 | 93 km | 47.6 mi | 4 |
| Apr 3, 1956 | EF4 | 70 km | 11.6 mi | 3 |
| Mar 21, 1952 | EF4 | 87 km | 46.8 mi | 38 |
| May 8, 2024 | EF3 | 85 km | 3.8 mi | 0 |
| Mar 31, 2023 | EF3 | 70 km | 86.0 mi | 9 |
| Dec 23, 2015 | EF3 | 13 km | 48.4 mi | 0 |
| Apr 28, 2014 | EF3 | 82 km | 15.6 mi | 2 |
| Apr 11, 2008 | EF3 | 85 km | 4.7 mi | 0 |
| Apr 11, 2008 | EF3 | 65 km | 10.3 mi | 0 |
| May 4, 2003 | EF3 | 92 km | 21.0 mi | 0 |
| Jun 26, 1994 | EF3 | 99 km | 3.0 mi | 0 |
| Jun 26, 1994 | EF3 | 15 km | 38.0 mi | 0 |
| Mar 22, 1991 | EF3 | 60 km | 22.0 mi | 4 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: BIG TREE (2,288 acres, 2015).
| Year | Name | Acres Burned | Distance |
| 2015 | BIG TREE | 2,288 | 100 km |
| 2022 | HOLLY SPRINGS BB10 11 12 14 | 1,977 | 90 km |
| 2015 | YELLOW RABBIT | 1,274 | 97 km |
| 2021 | HOLLY SPRINGS - BB 20/21 | 1,239 | 97 km |
| 2018 | UNNAMED | 1,152 | 86 km |
| 2021 | HOLLY SPRINGS - BB 15 | 1,126 | 86 km |
| 2013 | UNNAMED | 1,075 | 88 km |
| 2024 | HOLLY SPRINGS CPT 15 RX | 1,058 | 86 km |
| 2018 | UNNAMED | 1,004 | 88 km |
| 2011 | FORD | 984 | 87 km |
| 2022 | BK BEULAH | 974 | 87 km |
| 2012 | UNNAMED | 965 | 89 km |
| 2012 | UNNAMED | 947 | 88 km |
| 2022 | 1686 COUNTY ROAD 202 | 933 | 75 km |
| 2019 | UNNAMED | 857 | 99 km |
| 2016 | UNNAMED | 825 | 86 km |
| 2007 | ROCKHOUSE ROAD | 791 | 62 km |
| 2000 | UNNAMED | 762 | 17 km |
| 2018 | UNNAMED | 729 | 91 km |
| 2024 | HOLLY SPRINGS CPT 17-1 RX | 724 | 91 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 41°F (5°C) | 4.8 in | Coldest |
| February | 42°F (6°C) | 4.7 in | |
| March | 51°F (10°C) | 6.2 in | Wettest |
| April | 59°F (15°C) | 5.2 in | |
| May | 67°F (19°C) | 5.8 in | |
| June | 74°F (23°C) | 4.3 in | |
| July | 81°F (27°C) | 4.5 in | Warmest |
| August | 77°F (25°C) | 3.4 in | Driest |
| September | 71°F (22°C) | 4.1 in | |
| October | 60°F (15°C) | 3.5 in | |
| November | 50°F (10°C) | 5.4 in | |
| December | 41°F (5°C) | 5.9 in |
Walnut Grove CDP (Hardin County) has a seasonal temperature swing of 40°F / from 41°F in January to 81°F in July. Total annual precipitation is 57.8 inches, with March being the wettest month (6.2") and August the driest (3.4").