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Weather & Climate in Flat Rock, OH
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Flat Rock experiences four distinct seasons with an average annual temperature of 51°F (10°C). Winters average 26°F in January while summers reach 73°F in July. The area gets 275 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 40.1 inches. The area receives 32.7 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 801 feet.
Temperature
26°F Jan (-3°C)
73°F Jul (23°C)
| Annual Average | 50.5°F |
| 6% below US avg | |
| January Average | 26°F (-3°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 801 ft (244 m) |
| Area | 0.2 sq mi (0.5 km²) |
| Population Density | 1,605/sq mi |
| Coordinates | 41.2355°N, 82.8592°W |
| Timezone | America/New_York |
| County | Huron County County |
| Nearest Airport | Mansfield Lahm Regional (MFD) 34 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 50.3 / 100 |
| Social Vulnerability | 37.7 / 100 |
| Community Resilience | 77.6 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Moderate |
| Heat Wave | Very Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively High |
| Ice Storm | Relatively Moderate |
| Drought | No Rating |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
31 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.0.
| Jun 10, 2019 | 1 km NW of Timberlake, Ohio | M4.0 | 127 km | 2 km |
| Mar 12, 2007 | Ohio | M3.7 | 124 km | 5 km |
| Jan 26, 1991 | 1 km NNE of Mayfield Heights, Ohio | M3.4 | 122 km | 5 km |
| Apr 20, 2018 | Michigan | M3.4 | 99 km | 3 km |
| Jul 1, 2013 | 5 km NNW of Fairport Harbor, Ohio | M3.2 | 145 km | 5 km |
| Mar 11, 2006 | 8 km NNW of Mentor-on-the-Lake, Ohio | M3.1 | 137 km | 5 km |
| Jan 9, 2008 | 6 km WNW of Mentor-on-the-Lake, Ohio | M3.1 | 131 km | 5 km |
| Feb 23, 2011 | 18 km NE of Leamington, Canada | M3.0 | 109 km | 5 km |
| Jun 5, 2011 | 5 km W of Lodi, Ohio | M3.0 | 69 km | 5 km |
| Aug 7, 2000 | 2 km S of Limaville, Ohio | M2.9 | 146 km | 5 km |
| May 12, 2006 | 2 km E of Lima, Ohio | M2.8 | 116 km | 5 km |
| Apr 12, 2007 | 11 km NW of Put-in-Bay, Ohio | M2.8 | 54 km | 5 km |
| Sep 22, 1999 | 16 km NW of Mentor-on-the-Lake, Ohio | M2.8 | 133 km | 18 km |
| Jan 4, 2022 | 3 km NW of Timberlake, Ohio | M2.8 | 126 km | 5 km |
| Nov 25, 1998 | 1 km SSW of New London, Ohio | M2.7 | 42 km | 5 km |
| Apr 28, 2002 | Ohio | M2.7 | 142 km | 5 km |
| May 14, 2010 | 1 km ENE of Gibsonburg, Ohio | M2.7 | 41 km | 5 km |
| May 17, 2010 | 2 km S of Boston Heights, Ohio | M2.7 | 113 km | 5 km |
| Mar 8, 2013 | 5 km NNW of Timberlake, Ohio | M2.7 | 127 km | 5 km |
| Feb 10, 2006 | 6 km NW of Mentor-on-the-Lake, Ohio | M2.6 | 134 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
379 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 85 fatalities, 1,312 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 5, 2010 | EF4 | 67 km | 8.8 mi | 7 |
| Apr 11, 1965 | EF4 | 51 km | 22.0 mi | 18 |
| Apr 11, 1965 | EF4 | 78 km | 5.6 mi | 18 |
| Jun 8, 1953 | EF4 | 87 km | 118.0 mi | 17 |
| Jun 8, 1953 | EF4 | 85 km | 5.4 mi | 4 |
| Nov 10, 2002 | EF3 | 30 km | 21.0 mi | 1 |
| Jul 12, 1992 | EF3 | 72 km | 7.0 mi | 0 |
| May 2, 1983 | EF3 | 82 km | 5.0 mi | 1 |
| Jun 13, 1981 | EF3 | 82 km | 3.8 mi | 4 |
| Apr 3, 1974 | EF3 | 84 km | 0.3 mi | 0 |
| May 10, 1973 | EF3 | 48 km | 50.1 mi | 6 |
| Jun 2, 1971 | EF3 | 97 km | 39.6 mi | 0 |
| Apr 11, 1965 | EF3 | 29 km | 15.0 mi | 4 |
| Apr 17, 1963 | EF3 | 86 km | 0.5 mi | 0 |
| Mar 14, 2024 | EF2 | 29 km | 10.3 mi | 0 |
| Jun 15, 2023 | EF2 | 35 km | 3.4 mi | 0 |
| Jun 15, 2023 | EF2 | 79 km | 3.8 mi | 0 |
| Jun 15, 2023 | EF2 | 13 km | 8.7 mi | 0 |
| Apr 14, 2019 | EF2 | 46 km | 17.0 mi | 0 |
| Nov 5, 2017 | EF2 | 57 km | 1.1 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 26°F (-3°C) | 2.0 in | Coldest |
| February | 27°F (-3°C) | 1.8 in | Driest |
| March | 37°F (3°C) | 2.6 in | |
| April | 48°F (9°C) | 3.3 in | |
| May | 59°F (15°C) | 3.7 in | |
| June | 69°F (20°C) | 4.1 in | Wettest |
| July | 73°F (23°C) | 3.7 in | Warmest |
| August | 71°F (21°C) | 3.7 in | |
| September | 64°F (18°C) | 3.2 in | |
| October | 52°F (11°C) | 2.3 in | |
| November | 41°F (5°C) | 3.0 in | |
| December | 30°F (-1°C) | 2.8 in |
Flat Rock has a seasonal temperature swing of 47°F / from 26°F in January to 73°F in July. Total annual precipitation is 36.1 inches, with June being the wettest month (4.1") and February the driest (1.8").