Weather & Climate in Flat Rock, MI
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 74°F in July. Annual precipitation totals 34.3 inches. The area receives 45.0 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Moderate with a median AQI of 55. 33% of days have good air quality. The city sits at an elevation of 593 feet.
Temperature
26°F Jan (-3°C)
74°F Jul (23°C)
| Annual Average | 50.6°F |
| 6% below US avg | |
| January Average | 26°F (-3°C) |
| July Average | 74°F (23°C) |
Geography
| Elevation | 593 ft (181 m) |
| Area | 6.7 sq mi (17.3 km²) |
| Population Density | 1,586/sq mi |
| Coordinates | 42.0979°N, 83.2698°W |
| Timezone | America/Detroit |
| County | Wayne County County |
| Nearest Airport | Detroit Metro Wayne County (DTW) 9 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 55.0 |
| Rating | Moderate |
| Good Days % | 32.8% |
| Unhealthy Days | 8 |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 99.0 / 100 |
| Social Vulnerability | 76.2 / 100 |
| Community Resilience | 58.7 / 100 |
Hazard Breakdown
| Tornado | Very High |
| Hurricane | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Very High |
| Hail | Relatively Low |
| Strong Wind | Very High |
| Heat Wave | Relatively High |
| Winter Weather | Relatively High |
| Lightning | Very High |
| Ice Storm | Very High |
| Drought | No Rating |
| Cold Wave | Very High |
| Landslide | Very Low |
| Coastal Flood | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
16 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.5.
| Sep 2, 1994 | 5 km SSW of DeWitt, Michigan | M3.5 | 134 km | 5 km |
| Apr 20, 2018 | Michigan | M3.4 | 21 km | 3 km |
| Jun 30, 2015 | 5 km NNE of Burlington, Michigan | M3.3 | 147 km | 5 km |
| Feb 23, 2011 | 18 km NE of Leamington, Canada | M3.0 | 70 km | 5 km |
| Apr 12, 2007 | 11 km NW of Put-in-Bay, Ohio | M2.8 | 51 km | 5 km |
| May 14, 2010 | 1 km ENE of Gibsonburg, Ohio | M2.7 | 79 km | 5 km |
| Nov 25, 1998 | 1 km SSW of New London, Ohio | M2.7 | 135 km | 5 km |
| May 20, 2023 | 3 km SSE of Walbridge, Ohio | M2.6 | 63 km | 6 km |
| May 14, 2017 | 18 km ENE of Leamington, Canada | M2.6 | 71 km | 5 km |
| Jun 4, 1990 | 4 km SSE of Van Buren, Ohio | M2.5 | 115 km | 5 km |
| Mar 18, 2024 | 4 km WSW of Millbury, Ohio | M2.5 | 63 km | 6 km |
| Sep 7, 2012 | 17 km ESE of Stony Point, Michigan | M2.5 | 31 km | 5 km |
| Mar 8, 2010 | 7 km ENE of Grosse Ile, Michigan | M2.5 | 18 km | 18 km |
| Feb 7, 2016 | 6 km W of Put-in-Bay, Ohio | M2.5 | 59 km | 5 km |
| May 23, 2022 | 2 km NNW of Corunna, Canada | M2.5 | 112 km | 5 km |
| Feb 17, 2013 | 31 km E of Leamington, Canada | M2.5 | 87 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
313 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 56 fatalities, 1,057 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 5, 2010 | EF4 | 65 km | 8.8 mi | 7 |
| Mar 20, 1976 | EF4 | 49 km | 3.8 mi | 1 |
| Apr 11, 1965 | EF4 | 55 km | 5.6 mi | 18 |
| May 8, 1964 | EF4 | 73 km | 3.3 mi | 11 |
| Jul 4, 1957 | EF4 | 60 km | 29.9 mi | 0 |
| May 12, 1956 | EF4 | 17 km | 6.8 mi | 0 |
| Jun 8, 1953 | EF4 | 43 km | 5.4 mi | 4 |
| Mar 15, 2012 | EF3 | 66 km | 7.6 mi | 0 |
| Sep 14, 1990 | EF3 | 46 km | 24.0 mi | 0 |
| May 2, 1983 | EF3 | 47 km | 23.0 mi | 0 |
| May 2, 1983 | EF3 | 97 km | 5.0 mi | 1 |
| Jun 15, 1982 | EF3 | 95 km | 13.0 mi | 1 |
| Mar 20, 1976 | EF3 | 71 km | 17.1 mi | 1 |
| May 11, 1974 | EF3 | 70 km | 0.9 mi | 1 |
| Apr 3, 1974 | EF3 | 39 km | 0.3 mi | 0 |
| May 10, 1973 | EF3 | 97 km | 50.1 mi | 6 |
| Aug 2, 1972 | EF3 | 51 km | 0.1 mi | 0 |
| Jul 4, 1969 | EF3 | 26 km | 13.9 mi | 0 |
| Aug 22, 1964 | EF3 | 75 km | 0.1 mi | 0 |
| Apr 17, 1963 | EF3 | 20 km | 0.5 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 1.5 m (5 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1952 | LAKE HURON, MI | Avalanche | 1.5 m | - | 132 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 26°F (-3°C) | 2.2 in | Coldest |
| February | 28°F (-2°C) | 2.1 in | Driest |
| March | 37°F (3°C) | 2.4 in | |
| April | 49°F (9°C) | 3.3 in | |
| May | 60°F (16°C) | 3.7 in | Wettest |
| June | 70°F (21°C) | 3.3 in | |
| July | 74°F (23°C) | 3.5 in | Warmest |
| August | 72°F (22°C) | 3.3 in | |
| September | 65°F (18°C) | 3.2 in | |
| October | 53°F (12°C) | 2.5 in | |
| November | 41°F (5°C) | 2.6 in | |
| December | 31°F (-0°C) | 2.3 in |
Flat Rock has a seasonal temperature swing of 48°F / from 26°F in January to 74°F in July. Total annual precipitation is 34.3 inches, with May being the wettest month (3.7") and February the driest (2.1").