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Weather & Climate in Thornville, OH
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Thornville experiences four distinct seasons with an average annual temperature of 51°F (10°C). Winters average 27°F in January while summers reach 72°F in July. The area gets 293 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 44.4 inches. The area receives 20.2 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 43. The city sits at an elevation of 1,025 feet.
Temperature
27°F Jan (-3°C)
72°F Jul (22°C)
| Annual Average | 50.7°F |
| 6% below US avg | |
| January Average | 27°F (-3°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 1,025 ft (312 m) |
| Area | 1.1 sq mi (2.9 km²) |
| Population Density | 3,034/sq mi |
| Coordinates | 39.8946°N, 82.4202°W |
| Timezone | America/New_York |
| County | Perry County County |
| Nearest Airport | John Glenn Columbus International (CMH) 26 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 26.0 / 100 |
| Social Vulnerability | 48.4 / 100 |
| Community Resilience | 44.2 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Moderate |
| Cold Wave | Very Low |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
25 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.6.
| Feb 19, 1995 | 8 km SSE of Rocky Fork Point, Ohio | M3.6 | 125 km | 10 km |
| Nov 20, 2013 | 2 km SW of Buchtel, Ohio | M3.5 | 53 km | 8 km |
| May 24, 2017 | 1 km S of McArthur, Ohio | M3.4 | 74 km | 10 km |
| Jun 3, 2017 | 1 km WNW of Batesville, Ohio | M3.4 | 96 km | 2 km |
| Apr 24, 2009 | 7 km ENE of Rio Grande, Ohio | M3.4 | 111 km | 8 km |
| Aug 31, 2011 | 3 km SE of Lowell, Ohio | M3.1 | 92 km | 5 km |
| Feb 3, 2025 | 2 km NNW of Oak Hill, Ohio | M3.1 | 109 km | 26 km |
| Apr 22, 2025 | 3 km ESE of Buffalo, Ohio | M3.1 | 80 km | 5 km |
| Apr 24, 2025 | 3 km S of Pleasant City, Ohio | M3.1 | 75 km | 6 km |
| Apr 2, 2017 | 5 km W of Graysville, Ohio | M3.0 | 104 km | 4 km |
| Jun 5, 2011 | 5 km W of Lodi, Ohio | M3.0 | 130 km | 5 km |
| Apr 25, 2020 | 2 km SE of South Shore, Kentucky | M2.9 | 139 km | 27 km |
| May 9, 2025 | 3 km S of Pleasant City, Ohio | M2.9 | 75 km | 5 km |
| May 6, 2002 | 3 km SE of Racine, Ohio | M2.8 | 115 km | 5 km |
| Aug 31, 2011 | 2 km NNW of Belmont, West Virginia | M2.8 | 113 km | 5 km |
| Apr 29, 2025 | 1 km SE of Pleasant City, Ohio | M2.8 | 76 km | 2 km |
| Feb 3, 2025 | 0 km NE of Reno, Ohio | M2.8 | 105 km | 10 km |
| Nov 25, 1998 | 1 km SSW of New London, Ohio | M2.7 | 131 km | 5 km |
| Sep 4, 2011 | 3 km N of Saint Marys, West Virginia | M2.6 | 117 km | 5 km |
| Mar 8, 2016 | 0 km N of Thurman, Ohio | M2.6 | 110 km | 20 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
318 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 12 fatalities, 348 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Sep 16, 2010 | EF3 | 98 km | 9.1 mi | 1 |
| Oct 13, 1999 | EF3 | 58 km | 3.6 mi | 0 |
| May 31, 1985 | EF3 | 40 km | 29.0 mi | 1 |
| Jun 13, 1981 | EF3 | 79 km | 3.8 mi | 4 |
| Feb 22, 1971 | EF3 | 44 km | 6.8 mi | 0 |
| Sep 3, 1970 | EF3 | 54 km | 2.3 mi | 0 |
| Jun 5, 2024 | EF2 | 35 km | 1.3 mi | 0 |
| Apr 2, 2024 | EF2 | 93 km | 1.9 mi | 0 |
| Feb 28, 2024 | EF2 | 37 km | 14.0 mi | 0 |
| Jun 8, 2022 | EF2 | 64 km | 9.1 mi | 0 |
| Oct 15, 2021 | EF2 | 98 km | 0.9 mi | 0 |
| May 27, 2019 | EF2 | 50 km | 5.3 mi | 0 |
| Nov 5, 2017 | EF2 | 98 km | 1.1 mi | 0 |
| Apr 20, 2011 | EF2 | 15 km | 3.9 mi | 0 |
| Sep 16, 2010 | EF2 | 15 km | 7.0 mi | 0 |
| Sep 16, 2010 | EF2 | 56 km | 3.3 mi | 0 |
| Oct 11, 2006 | EF2 | 38 km | 0.5 mi | 0 |
| Oct 11, 2006 | EF2 | 60 km | 0.5 mi | 0 |
| Jun 22, 2006 | EF2 | 97 km | 6.0 mi | 0 |
| Nov 12, 2003 | EF2 | 98 km | 3.5 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Wildfire History
4 wildfires (100+ acres) recorded within 100 km. Largest: LONG RIDGE RX UNIT 37-38 (1,050 acres, 2022).
| Year | Name | Acres Burned | Distance |
| 2022 | LONG RIDGE RX UNIT 37-38 | 1,050 | 52 km |
| 2021 | LONG RIDGE RX UNIT 1-12 | 1,037 | 50 km |
| 2022 | LONG RIDGE RX UNIT 11-19 | 936 | 50 km |
| 2022 | LONG RIDGE RX UNIT 24 | 709 | 56 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 27°F (-3°C) | 2.4 in | Coldest |
| February | 30°F (-1°C) | 2.4 in | Driest |
| March | 40°F (4°C) | 3.4 in | |
| April | 50°F (10°C) | 3.8 in | |
| May | 60°F (16°C) | 4.4 in | Wettest |
| June | 69°F (20°C) | 4.0 in | |
| July | 72°F (22°C) | 4.4 in | Warmest |
| August | 71°F (22°C) | 3.9 in | |
| September | 65°F (18°C) | 3.0 in | |
| October | 53°F (12°C) | 2.6 in | |
| November | 43°F (6°C) | 3.4 in | |
| December | 33°F (0°C) | 3.0 in |
Thornville has a seasonal temperature swing of 45°F / from 27°F in January to 72°F in July. Total annual precipitation is 40.6 inches, with May being the wettest month (4.4") and February the driest (2.4").