All Countries
Weather & Climate in Grimsley, TN
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Grimsley enjoys a temperate climate with an average annual temperature of 56°F (13°C). Winters average 36°F in January while summers reach 74°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 59.8 inches (wetter than the 38-inch national average). The area receives 13.2 inches of snow annually. Air quality is rated Good with a median AQI of 40. The city sits at an elevation of 1,729 feet.
Temperature
36°F Jan (2°C)
74°F Jul (23°C)
| Annual Average | 55.5°F |
| 3% above US avg | |
| January Average | 36°F (2°C) |
| July Average | 74°F (23°C) |
| Sunny Days | 299 days/yr |
Geography
| Elevation | 1,729 ft (527 m) |
| Area | 10.9 sq mi (28.2 km²) |
| Population Density | 86/sq mi |
| Coordinates | 36.2761°N, 84.9969°W |
| Timezone | America/Chicago |
| County | Fentress County County |
| Nearest Airport | Lake Cumberland Regional (SME) 58 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 40.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 28.4 / 100 |
| Social Vulnerability | 87.3 / 100 |
| Community Resilience | 18.8 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Relatively Low |
| Flood | Very Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively High |
| Ice Storm | Relatively Low |
| Drought | Relatively Low |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
158 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.1.
| May 10, 2025 | 21 km SE of Greenback, Tennessee | M4.1 | 122 km | 25 km |
| Jul 30, 1997 | 6 km NNE of Tazewell, Tennessee | M3.8 | 132 km | 23 km |
| Jan 20, 2020 | 2 km NE of Fincastle, Tennessee | M3.8 | 89 km | 35 km |
| Sep 17, 2004 | 8 km ESE of Corbin, Kentucky | M3.7 | 115 km | 1 km |
| Jul 5, 1995 | 12 km ESE of Tellico Plains, Tennessee | M3.7 | 129 km | 10 km |
| Jun 17, 1998 | 9 km SSE of Coalfield, Tennessee | M3.6 | 66 km | 11 km |
| Jul 19, 1997 | 12 km E of Cohutta, Georgia | M3.5 | 148 km | 3 km |
| Jun 19, 2007 | 10 km ENE of Spencer, Tennessee | M3.5 | 63 km | 1 km |
| Mar 5, 2019 | 7 km NE of Maynardville, Tennessee | M3.4 | 113 km | 17 km |
| Apr 20, 2010 | 4 km SW of Maryville, Tennessee | M3.3 | 109 km | 2 km |
| Apr 11, 2006 | 5 km NE of Etowah, Tennessee | M3.3 | 112 km | 20 km |
| Aug 31, 2009 | 2 km NNE of Friendsville, Tennessee | M3.3 | 96 km | 14 km |
| Mar 18, 1995 | 10 km SE of Dayton, Tennessee | M3.3 | 95 km | 26 km |
| Jan 27, 2009 | 4 km NE of Williamsburg, Kentucky | M3.2 | 95 km | 26 km |
| Aug 1, 2009 | 8 km ENE of Ducktown, Tennessee | M3.2 | 149 km | 5 km |
| Jul 26, 2001 | 11 km N of Sevierville, Tennessee | M3.2 | 134 km | 14 km |
| Mar 7, 2001 | 5 km WNW of Decatur, Tennessee | M3.2 | 84 km | 18 km |
| Mar 7, 2001 | 6 km NW of Decatur, Tennessee | M3.2 | 82 km | 7 km |
| Jul 26, 2001 | 11 km S of New Market, Tennessee | M3.2 | 133 km | 17 km |
| May 10, 2006 | 3 km WNW of Madisonville, Tennessee | M3.2 | 99 km | 25 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
277 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 93 fatalities, 1,026 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Mar 3, 2020 | EF4 | 61 km | 8.4 mi | 19 |
| Apr 3, 1974 | EF4 | 28 km | 11.0 mi | 5 |
| Apr 3, 1974 | EF4 | 58 km | 28.4 mi | 10 |
| Apr 3, 1974 | EF4 | 53 km | 38.4 mi | 10 |
| Apr 3, 1974 | EF4 | 44 km | 16.1 mi | 0 |
| Apr 3, 1974 | EF4 | 8 km | 18.8 mi | 7 |
| Apr 27, 1971 | EF4 | 90 km | 13.0 mi | 2 |
| May 2, 1953 | EF4 | 86 km | 4.2 mi | 4 |
| Jul 27, 2014 | EF3 | 94 km | 4.7 mi | 0 |
| Mar 23, 2011 | EF3 | 97 km | 5.8 mi | 0 |
| Nov 10, 2002 | EF3 | 43 km | 12.2 mi | 4 |
| Nov 10, 2002 | EF3 | 45 km | 8.3 mi | 7 |
| Apr 16, 1998 | EF3 | 33 km | 8.6 mi | 0 |
| Mar 28, 1997 | EF3 | 93 km | 15.0 mi | 0 |
| May 18, 1995 | EF3 | 56 km | 9.0 mi | 0 |
| Feb 21, 1993 | EF3 | 72 km | 30.0 mi | 1 |
| Feb 21, 1993 | EF3 | 73 km | 16.0 mi | 0 |
| Feb 21, 1993 | EF3 | 55 km | 10.0 mi | 0 |
| Apr 20, 1986 | EF3 | 70 km | 3.0 mi | 0 |
| Apr 8, 1974 | EF3 | 100 km | 2.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: UNNAMED (11,663 acres, 1987).
| Year | Name | Acres Burned | Distance |
| 1987 | UNNAMED | 11,663 | 55 km |
| 2016 | STINKING CREEK | 10,768 | 74 km |
| 1987 | UNNAMED | 10,327 | 95 km |
| 2000 | UNNAMED | 8,064 | 63 km |
| 2000 | UNNAMED | 6,590 | 99 km |
| 1987 | K-T FIRE | 6,372 | 67 km |
| 1987 | UNNAMED | 5,973 | 67 km |
| 2000 | UNNAMED | 5,371 | 57 km |
| 2003 | UNNAMED | 4,675 | 45 km |
| 2001 | UNNAMED | 4,635 | 16 km |
| 1987 | UNNAMED | 4,194 | 89 km |
| 2013 | UNNAMED | 3,940 | 74 km |
| 1987 | UNNAMED | 3,907 | 92 km |
| 1987 | UNNAMED | 3,854 | 58 km |
| 2009 | GOBBLERS KNOB B | 3,851 | 41 km |
| 2021 | UNNAMED | 3,571 | 72 km |
| 2000 | UNNAMED | 3,539 | 54 km |
| 2021 | UNNAMED | 3,258 | 93 km |
| 2016 | WHITE OAK CIRCLE | 3,182 | 38 km |
| 2000 | UNNAMED | 3,123 | 87 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 36°F (2°C) | 4.7 in | Coldest |
| February | 38°F (3°C) | 4.5 in | |
| March | 46°F (8°C) | 5.7 in | Wettest |
| April | 55°F (13°C) | 4.5 in | |
| May | 62°F (17°C) | 5.4 in | |
| June | 70°F (21°C) | 4.6 in | |
| July | 74°F (23°C) | 5.3 in | Warmest |
| August | 73°F (23°C) | 4.2 in | |
| September | 67°F (19°C) | 4.0 in | |
| October | 56°F (13°C) | 3.5 in | Driest |
| November | 46°F (8°C) | 4.7 in | |
| December | 38°F (3°C) | 5.1 in |
Grimsley has a seasonal temperature swing of 38°F / from 36°F in January to 74°F in July. Total annual precipitation is 56.1 inches, with March being the wettest month (5.7") and October the driest (3.5").