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Weather & Climate in St. Clair, MI
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
St. Clair experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 25°F in January while summers reach 73°F in July. The area gets 260 sunny days per year, above the national average. Annual precipitation totals 34.9 inches. The area receives 35.5 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 41. 73% of days have good air quality. The city sits at an elevation of 616 feet.
Temperature
25°F Jan (-4°C)
73°F Jul (23°C)
| Annual Average | 49.5°F |
| 8% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 260 days/yr |
Geography
| Elevation | 616 ft (188 m) |
| Area | 3.6 sq mi (9.3 km²) |
| Population Density | 1,898/sq mi |
| Coordinates | 42.8265°N, 82.4924°W |
| Timezone | America/Detroit |
| County | St. Clair County County |
| Nearest Airport | St Clair County International (PHN) 6 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
| Good Days % | 72.5% |
| Unhealthy Days | 3 |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 82.0 / 100 |
| Social Vulnerability | 32.6 / 100 |
| Community Resilience | 89.2 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively High |
| Drought | No Rating |
| Cold Wave | Relatively 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.
| Mar 15, 1992 | 15 km NW of North Perry, Ohio | M3.5 | 144 km | 5 km |
| Apr 20, 2018 | Michigan | M3.4 | 90 km | 3 km |
| Mar 11, 2006 | 8 km NNW of Mentor-on-the-Lake, Ohio | M3.1 | 148 km | 5 km |
| Feb 23, 2011 | 18 km NE of Leamington, Canada | M3.0 | 75 km | 5 km |
| Apr 12, 2007 | 11 km NW of Put-in-Bay, Ohio | M2.8 | 128 km | 5 km |
| Sep 22, 1999 | 16 km NW of Mentor-on-the-Lake, Ohio | M2.8 | 139 km | 18 km |
| Apr 28, 2002 | Ohio | M2.7 | 143 km | 5 km |
| May 14, 2017 | 18 km ENE of Leamington, Canada | M2.6 | 77 km | 5 km |
| Jan 6, 2006 | 10 km NW of Mentor-on-the-Lake, Ohio | M2.6 | 145 km | 5 km |
| Jun 10, 2010 | 8 km NW of Mentor-on-the-Lake, Ohio | M2.6 | 147 km | 5 km |
| Feb 10, 2006 | 6 km NW of Mentor-on-the-Lake, Ohio | M2.6 | 149 km | 5 km |
| Sep 7, 2012 | 17 km ESE of Stony Point, Michigan | M2.5 | 117 km | 5 km |
| Mar 8, 2010 | 7 km ENE of Grosse Ile, Michigan | M2.5 | 88 km | 18 km |
| Feb 7, 2016 | 6 km W of Put-in-Bay, Ohio | M2.5 | 135 km | 5 km |
| May 23, 2022 | 2 km NNW of Corunna, Canada | M2.5 | 9 km | 5 km |
| Feb 17, 2013 | 31 km E of Leamington, Canada | M2.5 | 93 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
159 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 24 fatalities, 672 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Mar 20, 1976 | EF4 | 83 km | 3.8 mi | 1 |
| May 8, 1964 | EF4 | 33 km | 3.3 mi | 11 |
| May 12, 1956 | EF4 | 88 km | 6.8 mi | 0 |
| May 12, 1956 | EF4 | 99 km | 6.6 mi | 3 |
| Jun 8, 1953 | EF4 | 67 km | 33.8 mi | 0 |
| May 21, 1953 | EF4 | 14 km | 10.0 mi | 2 |
| Jul 2, 1997 | EF3 | 100 km | 1.7 mi | 1 |
| Sep 14, 1990 | EF3 | 89 km | 24.0 mi | 0 |
| Sep 2, 1984 | EF3 | 48 km | 15.6 mi | 0 |
| May 2, 1983 | EF3 | 56 km | 23.0 mi | 0 |
| Mar 20, 1976 | EF3 | 41 km | 17.1 mi | 1 |
| Jul 14, 1974 | EF3 | 90 km | 1.0 mi | 0 |
| Aug 2, 1972 | EF3 | 87 km | 0.1 mi | 0 |
| Nov 20, 1957 | EF3 | 69 km | 1.5 mi | 1 |
| Feb 28, 2024 | EF2 | 97 km | 5.7 mi | 0 |
| May 28, 2013 | EF2 | 89 km | 4.6 mi | 0 |
| Mar 15, 2012 | EF2 | 84 km | 4.6 mi | 0 |
| Sep 13, 2008 | EF2 | 94 km | 2.7 mi | 0 |
| Jul 2, 1997 | EF2 | 78 km | 5.0 mi | 0 |
| Jun 21, 1996 | EF2 | 41 km | 0.2 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Tsunami History
2 tsunamis recorded within 500 km. Highest wave on record: 2.7 m (9 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1823 | LAKE ERIE | Unknown | 2.7 m | - | 136 km |
| 1952 | LAKE HURON, MI | Avalanche | 1.5 m | - | 31 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 25°F (-4°C) | 2.1 in | |
| February | 24°F (-5°C) | 2.1 in | Coldest, Driest |
| March | 33°F (1°C) | 2.3 in | |
| April | 44°F (7°C) | 3.0 in | |
| May | 56°F (13°C) | 3.0 in | |
| June | 66°F (19°C) | 3.3 in | |
| July | 73°F (23°C) | 2.8 in | Warmest |
| August | 70°F (21°C) | 3.2 in | |
| September | 63°F (17°C) | 3.9 in | Wettest |
| October | 52°F (11°C) | 2.7 in | |
| November | 40°F (5°C) | 3.2 in | |
| December | 29°F (-2°C) | 2.6 in |
St. Clair has a seasonal temperature swing of 50°F / from 24°F in February to 73°F in July. Total annual precipitation is 34.2 inches, with September being the wettest month (3.9") and February the driest (2.1").