All Countries
Weather & Climate in Hemlock, OH
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Hemlock 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 910 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 | 910 ft (277 m) |
| Area | 0.4 sq mi (1.0 km²) |
| Population Density | 770/sq mi |
| Coordinates | 39.5925°N, 82.1524°W |
| Timezone | America/New_York |
| County | Perry County County |
| Nearest Airport | Mid-Ohio Valley Regional (PKB) 42 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
27 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 | 17 km | 8 km |
| Jun 3, 2017 | 1 km WNW of Batesville, Ohio | M3.4 | 82 km | 2 km |
| May 24, 2017 | 1 km S of McArthur, Ohio | M3.4 | 49 km | 10 km |
| Apr 24, 2009 | 7 km ENE of Rio Grande, Ohio | M3.4 | 78 km | 8 km |
| Feb 3, 2025 | 2 km NNW of Oak Hill, Ohio | M3.1 | 83 km | 26 km |
| Aug 31, 2011 | 3 km SE of Lowell, Ohio | M3.1 | 59 km | 5 km |
| Apr 22, 2025 | 3 km ESE of Buffalo, Ohio | M3.1 | 67 km | 5 km |
| Apr 24, 2025 | 3 km S of Pleasant City, Ohio | M3.1 | 61 km | 6 km |
| Apr 2, 2017 | 5 km W of Graysville, Ohio | M3.0 | 78 km | 4 km |
| Apr 25, 2020 | 2 km SE of South Shore, Kentucky | M2.9 | 119 km | 27 km |
| May 9, 2025 | 3 km S of Pleasant City, Ohio | M2.9 | 61 km | 5 km |
| May 6, 2002 | 3 km SE of Racine, Ohio | M2.8 | 75 km | 5 km |
| Aug 31, 2011 | 2 km NNW of Belmont, West Virginia | M2.8 | 79 km | 5 km |
| Jul 30, 2013 | 12 km SSW of Glenville, West Virginia | M2.8 | 136 km | 13 km |
| Apr 29, 2025 | 1 km SE of Pleasant City, Ohio | M2.8 | 63 km | 2 km |
| Feb 3, 2025 | 0 km NE of Reno, Ohio | M2.8 | 70 km | 10 km |
| Jul 20, 2013 | 6 km SW of Glenville, West Virginia | M2.7 | 134 km | 21 km |
| Jun 6, 2014 | 13 km NNE of Sissonville, West Virginia | M2.6 | 116 km | 30 km |
| Mar 8, 2016 | 0 km N of Thurman, Ohio | M2.6 | 81 km | 20 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
247 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 4 fatalities, 200 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Sep 16, 2010 | EF3 | 58 km | 9.1 mi | 1 |
| Oct 13, 1999 | EF3 | 71 km | 3.6 mi | 0 |
| May 31, 1985 | EF3 | 80 km | 29.0 mi | 1 |
| Feb 22, 1971 | EF3 | 79 km | 6.8 mi | 0 |
| Sep 3, 1970 | EF3 | 70 km | 2.3 mi | 0 |
| Jun 5, 2024 | EF2 | 59 km | 1.3 mi | 0 |
| Apr 2, 2024 | EF2 | 74 km | 1.9 mi | 0 |
| Feb 28, 2024 | EF2 | 90 km | 4.1 mi | 0 |
| Feb 28, 2024 | EF2 | 74 km | 14.0 mi | 0 |
| Jun 8, 2022 | EF2 | 56 km | 9.1 mi | 0 |
| May 27, 2019 | EF2 | 50 km | 5.3 mi | 0 |
| Apr 20, 2011 | EF2 | 55 km | 3.9 mi | 0 |
| Sep 16, 2010 | EF2 | 28 km | 7.0 mi | 0 |
| Sep 16, 2010 | EF2 | 22 km | 3.3 mi | 0 |
| Oct 11, 2006 | EF2 | 78 km | 0.5 mi | 0 |
| Oct 11, 2006 | EF2 | 85 km | 0.5 mi | 0 |
| Jul 10, 2003 | EF2 | 58 km | 2.5 mi | 0 |
| May 8, 2002 | EF2 | 82 km | 3.0 mi | 0 |
| Sep 20, 2000 | EF2 | 83 km | 21.0 mi | 0 |
| Jun 15, 2000 | EF2 | 96 km | 2.5 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
5 wildfires (100+ acres) recorded within 100 km. Largest: 127 (1,349 acres, 2022).
| Year | Name | Acres Burned | Distance |
| 2022 | 127 | 1,349 | 100 km |
| 2022 | LONG RIDGE RX UNIT 37-38 | 1,050 | 13 km |
| 2021 | LONG RIDGE RX UNIT 1-12 | 1,037 | 12 km |
| 2022 | LONG RIDGE RX UNIT 11-19 | 936 | 13 km |
| 2022 | LONG RIDGE RX UNIT 24 | 709 | 18 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 27°F (-3°C) | 2.5 in | Coldest |
| February | 31°F (-0°C) | 2.5 in | Driest |
| March | 41°F (5°C) | 3.5 in | |
| April | 51°F (11°C) | 3.6 in | |
| May | 60°F (16°C) | 4.3 in | Wettest |
| June | 69°F (20°C) | 3.9 in | |
| July | 72°F (22°C) | 4.3 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) | 3.2 in | |
| December | 33°F (1°C) | 3.1 in |
Hemlock has a seasonal temperature swing of 45°F / from 27°F in January to 72°F in July. Total annual precipitation is 40.4 inches, with May being the wettest month (4.3") and February the driest (2.5").