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Weather & Climate in Dorchester, ON
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Dorchester experiences four distinct seasons with an average annual temperature of 49°F (10°C). Winters average 31°F in January while summers reach 70°F in July. The area gets 235 sunny days per year, above the national average. Annual precipitation totals 38.7 inches. The area receives 34.0 inches of snow annually, a moderate snowfall amount. The city sits at an elevation of 856 feet.
Temperature
31°F Jan (-1°C)
70°F Jul (21°C)
| Annual Average | 49.4°F |
| 9% below US avg | |
| January Average | 31°F (-1°C) |
| July Average | 70°F (21°C) |
| Sunny Days | 235 days/yr |
Geography
| Elevation | 856 ft (261 m) |
| Area | 270.4 sq mi (700.4 km²) |
| Population Density | 35/sq mi |
| Coordinates | 42.9834°N, 81.0664°W |
| Timezone | America/Toronto |
Precipitation & Snow
Air Quality
Earthquake History
35 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 | 149 km | 2 km |
| Jan 26, 2001 | 8 km NNW of Edgewood, Ohio | M3.9 | 118 km | 5 km |
| Oct 16, 1993 | 8 km SSE of Madison, Ohio | M3.6 | 143 km | 5 km |
| Jun 30, 2003 | 6 km NW of Perry, Ohio | M3.6 | 132 km | 5 km |
| Aug 28, 2023 | 7 km SE of Madison, Ohio | M3.6 | 139 km | 5 km |
| Jun 20, 2006 | 9 km WNW of North Perry, Ohio | M3.5 | 128 km | 5 km |
| Mar 15, 1992 | 15 km NW of North Perry, Ohio | M3.5 | 120 km | 5 km |
| Jun 3, 2001 | 3 km N of Edgewood, Ohio | M3.4 | 122 km | 5 km |
| Jun 30, 2004 | 2 km WNW of Madison, Ohio | M3.3 | 134 km | 5 km |
| Jul 1, 2013 | 5 km NNW of Fairport Harbor, Ohio | M3.2 | 134 km | 5 km |
| Jan 9, 2008 | 6 km WNW of Mentor-on-the-Lake, Ohio | M3.1 | 144 km | 5 km |
| Mar 11, 2006 | 8 km NNW of Mentor-on-the-Lake, Ohio | M3.1 | 136 km | 5 km |
| Apr 25, 2010 | 2 km WNW of Madison, Ohio | M3.0 | 134 km | 5 km |
| Feb 23, 2011 | 18 km NE of Leamington, Canada | M3.0 | 145 km | 5 km |
| Feb 23, 1995 | 3 km W of Ashtabula, Ohio | M2.9 | 125 km | 5 km |
| Jan 4, 2022 | 3 km NW of Timberlake, Ohio | M2.8 | 148 km | 5 km |
| Sep 22, 1999 | 16 km NW of Mentor-on-the-Lake, Ohio | M2.8 | 133 km | 18 km |
| Mar 28, 2005 | 16 km NW of Virgil, Canada | M2.8 | 149 km | 7 km |
| Apr 28, 2002 | Ohio | M2.7 | 129 km | 5 km |
| Mar 8, 2013 | 5 km NNW of Timberlake, Ohio | M2.7 | 145 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 | - | 109 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 31°F (-1°C) | 2.8 in | |
| February | 22°F (-5°C) | 2.4 in | Coldest, Driest |
| March | 32°F (-0°C) | 2.9 in | |
| April | 44°F (6°C) | 3.3 in | |
| May | 56°F (13°C) | 3.4 in | |
| June | 65°F (18°C) | 3.5 in | |
| July | 70°F (21°C) | 3.4 in | Warmest |
| August | 68°F (20°C) | 3.4 in | |
| September | 61°F (16°C) | 3.8 in | |
| October | 49°F (10°C) | 3.3 in | |
| November | 39°F (4°C) | 3.9 in | Wettest |
| December | 27°F (-3°C) | 3.5 in |
Dorchester has a seasonal temperature swing of 47°F / from 22°F in February to 70°F in July. Total annual precipitation is 39.4 inches, with November being the wettest month (3.9") and February the driest (2.4").