Weather & Climate in Adelphi, OH
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Adelphi experiences four distinct seasons with an average annual temperature of 54°F (12°C). Winters average 31°F in January while summers reach 75°F in July. Annual precipitation totals 40.2 inches. The area receives 15.3 inches of snow annually, a moderate snowfall amount. The city sits at an elevation of 838 feet.
Temperature
31°F Jan (-1°C)
75°F Jul (24°C)
| Annual Average | 54.3°F |
| 1% above US avg | |
| January Average | 31°F (-1°C) |
| July Average | 75°F (24°C) |
Geography
| Elevation | 838 ft (255 m) |
| Area | 0.3 sq mi (0.7 km²) |
| Population Density | 1,211/sq mi |
| Coordinates | 39.4645°N, 82.7461°W |
| Timezone | America/New_York |
| County | Hocking County County |
| Nearest Airport | Rickenbacker International (LCK) 26 miles away |
Precipitation & Snow
Air Quality
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 47.3 / 100 |
| Social Vulnerability | 46.9 / 100 |
| Community Resilience | 51.4 / 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 Low |
| Cold Wave | Very Low |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
28 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.6.
| Feb 19, 1995 | 8 km SSE of Rocky Fork Point, Ohio | M3.6 | 73 km | 10 km |
| Nov 20, 2013 | 2 km SW of Buchtel, Ohio | M3.5 | 47 km | 8 km |
| May 24, 2017 | 1 km S of McArthur, Ohio | M3.4 | 35 km | 10 km |
| Jun 3, 2017 | 1 km WNW of Batesville, Ohio | M3.4 | 134 km | 2 km |
| Apr 24, 2009 | 7 km ENE of Rio Grande, Ohio | M3.4 | 74 km | 8 km |
| Apr 24, 2025 | 3 km S of Pleasant City, Ohio | M3.1 | 112 km | 6 km |
| Apr 22, 2025 | 3 km ESE of Buffalo, Ohio | M3.1 | 118 km | 5 km |
| Feb 3, 2025 | 2 km NNW of Oak Hill, Ohio | M3.1 | 62 km | 26 km |
| Aug 31, 2011 | 3 km SE of Lowell, Ohio | M3.1 | 110 km | 5 km |
| Apr 2, 2017 | 5 km W of Graysville, Ohio | M3.0 | 131 km | 4 km |
| Apr 25, 2020 | 2 km SE of South Shore, Kentucky | M2.9 | 86 km | 27 km |
| May 9, 2025 | 3 km S of Pleasant City, Ohio | M2.9 | 112 km | 5 km |
| Apr 29, 2025 | 1 km SE of Pleasant City, Ohio | M2.8 | 115 km | 2 km |
| May 6, 2002 | 3 km SE of Racine, Ohio | M2.8 | 94 km | 5 km |
| Feb 3, 2025 | 0 km NE of Reno, Ohio | M2.8 | 117 km | 10 km |
| Mar 17, 1999 | 2 km NNE of Ripley, Ohio | M2.8 | 122 km | 0 km |
| Aug 31, 2011 | 2 km NNW of Belmont, West Virginia | M2.8 | 127 km | 5 km |
| May 11, 2015 | 5 km ESE of Maysville, Kentucky | M2.6 | 124 km | 11 km |
| Sep 4, 2011 | 3 km N of Saint Marys, West Virginia | M2.6 | 132 km | 5 km |
| Feb 11, 2015 | 8 km SE of Richmond Dale, Ohio | M2.6 | 35 km | 20 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
324 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 12 fatalities, 303 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Apr 23, 1968 | EF5 | 85 km | 34.0 mi | 7 |
| May 14, 2014 | EF3 | 98 km | 8.9 mi | 0 |
| Sep 16, 2010 | EF3 | 89 km | 9.1 mi | 1 |
| Oct 13, 1999 | EF3 | 25 km | 3.6 mi | 0 |
| Jun 30, 1993 | EF3 | 81 km | 15.0 mi | 0 |
| May 31, 1985 | EF3 | 79 km | 29.0 mi | 1 |
| Feb 22, 1971 | EF3 | 58 km | 6.8 mi | 0 |
| Sep 3, 1970 | EF3 | 28 km | 2.3 mi | 0 |
| Apr 23, 1968 | EF3 | 85 km | 0.1 mi | 0 |
| Nov 16, 1965 | EF3 | 63 km | 3.8 mi | 0 |
| Apr 8, 1965 | EF3 | 69 km | 2.0 mi | 0 |
| Feb 10, 1959 | EF3 | 93 km | 10.5 mi | 0 |
| Jun 5, 2024 | EF2 | 90 km | 1.3 mi | 0 |
| Apr 2, 2024 | EF2 | 42 km | 1.9 mi | 0 |
| Feb 28, 2024 | EF2 | 100 km | 21.1 mi | 0 |
| Feb 28, 2024 | EF2 | 62 km | 14.0 mi | 0 |
| Jun 8, 2022 | EF2 | 10 km | 9.1 mi | 0 |
| Oct 15, 2021 | EF2 | 50 km | 0.9 mi | 0 |
| May 27, 2019 | EF2 | 6 km | 5.3 mi | 0 |
| Mar 2, 2012 | EF2 | 99 km | 11.1 mi | 1 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Wildfire History
8 wildfires (100+ acres) recorded within 100 km. Largest: UNNAMED (3,259 acres, 2009).
| Year | Name | Acres Burned | Distance |
| 2009 | UNNAMED | 3,259 | 95 km |
| 2022 | 127 | 1,349 | 79 km |
| 2019 | CY19 BLUEGRASS PRESCRIBED BURN | 1,190 | 96 km |
| 2022 | LONG RIDGE RX UNIT 37-38 | 1,050 | 52 km |
| 2003 | PEACH ORCHARD | 1,043 | 82 km |
| 2021 | LONG RIDGE RX UNIT 1-12 | 1,037 | 49 km |
| 2022 | LONG RIDGE RX UNIT 11-19 | 936 | 48 km |
| 2022 | LONG RIDGE RX UNIT 24 | 709 | 52 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 31°F (-1°C) | 2.8 in | Coldest |
| February | 34°F (1°C) | 2.5 in | Driest |
| March | 42°F (6°C) | 3.3 in | |
| April | 54°F (12°C) | 4.0 in | |
| May | 64°F (18°C) | 4.1 in | |
| June | 73°F (23°C) | 4.3 in | Wettest |
| July | 75°F (24°C) | 4.0 in | Warmest |
| August | 74°F (23°C) | 3.5 in | |
| September | 68°F (20°C) | 3.2 in | |
| October | 56°F (14°C) | 3.0 in | |
| November | 45°F (7°C) | 2.9 in | |
| December | 36°F (2°C) | 2.8 in |
Adelphi has a seasonal temperature swing of 45°F / from 31°F in January to 75°F in July. Total annual precipitation is 40.2 inches, with June being the wettest month (4.3") and February the driest (2.5").