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Weather & Climate in St. Clair, ON
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
St. Clair experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 24°F in January while summers reach 73°F in July. The area gets 272 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 35.3 inches. The area receives 9.5 inches of snow annually. The city sits at an elevation of 591 feet.
Temperature
24°F Jan (-5°C)
73°F Jul (23°C)
| Annual Average | 49.0°F |
| 9% below US avg | |
| January Average | 24°F (-5°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 272 days/yr |
Geography
| Elevation | 591 ft (180 m) |
| Area | 238.8 sq mi (618.6 km²) |
| Population Density | 61/sq mi |
| Coordinates | 42.3192°N, 82.8578°W |
| Timezone | America/Toronto |
Precipitation & Snow
Air Quality
Earthquake History
29 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 | 136 km | 2 km |
| Jun 30, 2003 | 6 km NW of Perry, Ohio | M3.6 | 149 km | 5 km |
| Mar 15, 1992 | 15 km NW of North Perry, Ohio | M3.5 | 141 km | 5 km |
| Jun 20, 2006 | 9 km WNW of North Perry, Ohio | M3.5 | 145 km | 5 km |
| Jan 26, 1991 | 1 km NNE of Mayfield Heights, Ohio | M3.4 | 145 km | 5 km |
| Apr 20, 2018 | Michigan | M3.4 | 26 km | 3 km |
| Jul 1, 2013 | 5 km NNW of Fairport Harbor, Ohio | M3.2 | 142 km | 5 km |
| Jan 9, 2008 | 6 km WNW of Mentor-on-the-Lake, Ohio | M3.1 | 136 km | 5 km |
| Mar 11, 2006 | 8 km NNW of Mentor-on-the-Lake, Ohio | M3.1 | 135 km | 5 km |
| Feb 23, 2011 | 18 km NE of Leamington, Canada | M3.0 | 40 km | 5 km |
| Apr 12, 2007 | 11 km NW of Put-in-Bay, Ohio | M2.8 | 67 km | 5 km |
| Sep 22, 1999 | 16 km NW of Mentor-on-the-Lake, Ohio | M2.8 | 127 km | 18 km |
| Jan 4, 2022 | 3 km NW of Timberlake, Ohio | M2.8 | 135 km | 5 km |
| Nov 25, 1998 | 1 km SSW of New London, Ohio | M2.7 | 144 km | 5 km |
| Mar 8, 2013 | 5 km NNW of Timberlake, Ohio | M2.7 | 133 km | 5 km |
| Apr 28, 2002 | Ohio | M2.7 | 133 km | 5 km |
| May 14, 2010 | 1 km ENE of Gibsonburg, Ohio | M2.7 | 110 km | 5 km |
| May 14, 2017 | 18 km ENE of Leamington, Canada | M2.6 | 42 km | 5 km |
| Jun 10, 2010 | 8 km NW of Mentor-on-the-Lake, Ohio | M2.6 | 133 km | 5 km |
| Jan 6, 2006 | 10 km NW of Mentor-on-the-Lake, Ohio | M2.6 | 131 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
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 | — | 95 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 24°F (-5°C) | 1.9 in | Coldest, Driest |
| February | 26°F (-3°C) | 2.0 in | |
| March | 36°F (2°C) | 2.7 in | |
| April | 47°F (8°C) | 3.2 in | |
| May | 59°F (15°C) | 3.2 in | |
| June | 68°F (20°C) | 3.3 in | |
| July | 73°F (23°C) | 3.4 in | Warmest |
| August | 71°F (22°C) | 3.3 in | |
| September | 64°F (18°C) | 3.7 in | Wettest |
| October | 52°F (11°C) | 2.6 in | |
| November | 41°F (5°C) | 3.2 in | |
| December | 30°F (-1°C) | 2.9 in |
St. Clair has a seasonal temperature swing of 49°F / from 24°F in January to 73°F in July. Total annual precipitation is 35.3 inches, with September being the wettest month (3.7") and January the driest (1.9").