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Weather & Climate in Southwest Middlesex, ON
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Southwest Middlesex experiences four distinct seasons with an average annual temperature of 47°F (8°C). Winters average 22°F in January while summers reach 70°F in July. The area gets 268 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 37.6 inches. The area receives 10.6 inches of snow annually. The city sits at an elevation of 728 feet.
Temperature
22°F Jan (-6°C)
70°F Jul (21°C)
| Annual Average | 46.8°F |
| 13% below US avg | |
| January Average | 22°F (-6°C) |
| July Average | 70°F (21°C) |
| Sunny Days | 268 days/yr |
Geography
| Elevation | 728 ft (222 m) |
| Area | 165.2 sq mi (427.8 km²) |
| Population Density | 36/sq mi |
| Coordinates | 42.7426°N, 81.7035°W |
| Timezone | America/Toronto |
Precipitation & Snow
Air Quality
Earthquake History
36 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 | 120 km | 2 km |
| Jan 26, 2001 | 8 km NNW of Edgewood, Ohio | M3.9 | 116 km | 5 km |
| Oct 16, 1993 | 8 km SSE of Madison, Ohio | M3.6 | 129 km | 5 km |
| Aug 28, 2023 | 7 km SE of Madison, Ohio | M3.6 | 128 km | 5 km |
| Jun 30, 2003 | 6 km NW of Perry, Ohio | M3.6 | 113 km | 5 km |
| Mar 15, 1992 | 15 km NW of North Perry, Ohio | M3.5 | 100 km | 5 km |
| Jun 20, 2006 | 9 km WNW of North Perry, Ohio | M3.5 | 108 km | 5 km |
| Apr 20, 2018 | Michigan | M3.4 | 128 km | 3 km |
| Jun 3, 2001 | 3 km N of Edgewood, Ohio | M3.4 | 121 km | 5 km |
| Jan 26, 1991 | 1 km NNE of Mayfield Heights, Ohio | M3.4 | 136 km | 5 km |
| Jun 30, 2004 | 2 km WNW of Madison, Ohio | M3.3 | 119 km | 5 km |
| Jul 1, 2013 | 5 km NNW of Fairport Harbor, Ohio | M3.2 | 111 km | 5 km |
| Jan 9, 2008 | 6 km WNW of Mentor-on-the-Lake, Ohio | M3.1 | 116 km | 5 km |
| Mar 11, 2006 | 8 km NNW of Mentor-on-the-Lake, Ohio | M3.1 | 110 km | 5 km |
| Feb 23, 2011 | 18 km NE of Leamington, Canada | M3.0 | 88 km | 5 km |
| Apr 25, 2010 | 2 km WNW of Madison, Ohio | M3.0 | 119 km | 5 km |
| Feb 23, 1995 | 3 km W of Ashtabula, Ohio | M2.9 | 121 km | 5 km |
| Jan 4, 2022 | 3 km NW of Timberlake, Ohio | M2.8 | 119 km | 5 km |
| Sep 22, 1999 | 16 km NW of Mentor-on-the-Lake, Ohio | M2.8 | 104 km | 18 km |
| Mar 8, 2013 | 5 km NNW of Timberlake, Ohio | M2.7 | 117 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
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 | - | 77 km |
| 1952 | LAKE HURON, MI | Avalanche | 1.5 m | - | 69 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 22°F (-6°C) | 2.6 in | Coldest |
| February | 23°F (-5°C) | 2.3 in | Driest |
| March | 32°F (0°C) | 2.6 in | |
| April | 44°F (6°C) | 3.4 in | |
| May | 56°F (13°C) | 3.2 in | |
| June | 65°F (18°C) | 3.3 in | |
| July | 70°F (21°C) | 3.2 in | Warmest |
| August | 69°F (20°C) | 3.4 in | |
| September | 62°F (17°C) | 3.8 in | Wettest |
| October | 51°F (10°C) | 3.0 in | |
| November | 40°F (4°C) | 3.7 in | |
| December | 29°F (-2°C) | 3.2 in |
Southwest Middlesex has a seasonal temperature swing of 48°F / from 22°F in January to 70°F in July. Total annual precipitation is 37.6 inches, with September being the wettest month (3.8") and February the driest (2.3").