Weather & Climate in Blandford-Blenheim, ON
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Blandford-Blenheim has a cool climate with an average annual temperature of 45°F (7°C). Winters average 20°F in January while summers reach 68°F in July. Annual precipitation totals 37.2 inches. The area receives 10.2 inches of snow annually. The city sits at an elevation of 1,007 feet.
Temperature
20°F Jan (-7°C)
68°F Jul (20°C)
| Annual Average | 44.8°F |
| 17% below US avg | |
| January Average | 20°F (-7°C) |
| July Average | 68°F (20°C) |
Geography
| Elevation | 1,007 ft (307 m) |
| Area | 147.5 sq mi (382.0 km²) |
| Population Density | 51/sq mi |
| Coordinates | 43.2463°N, 80.5986°W |
| Timezone | America/Toronto |
Precipitation & Snow
Air Quality
Earthquake History
10 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.9.
| Jan 26, 2001 | 8 km NNW of Edgewood, Ohio | M3.9 | 146 km | 5 km |
| Nov 26, 1999 | 14 km ESE of Centennial Scarborough, Canada | M3.8 | 139 km | 13 km |
| Jun 3, 2001 | 3 km N of Edgewood, Ohio | M3.4 | 150 km | 5 km |
| May 24, 2000 | 4 km ENE of Centennial Scarborough, Canada | M3.1 | 136 km | 18 km |
| May 8, 2018 | 14 km SSE of Ajax, Canada | M3.0 | 144 km | 5 km |
| May 25, 1995 | 3 km NW of Amherst, New York | M3.0 | 146 km | 5 km |
| Jun 16, 2004 | 11 km NNW of Angola on the Lake, New York | M2.9 | 135 km | 6 km |
| Mar 28, 2005 | 16 km NW of Virgil, Canada | M2.8 | 107 km | 7 km |
| Sep 20, 2009 | 20 km ESE of Oakville, Canada | M2.6 | 95 km | 4 km |
| Dec 17, 1990 | 5 km SSE of Middleboro, Pennsylvania | M2.5 | 149 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 | - | 111 km |
| 1952 | LAKE HURON, MI | Avalanche | 1.5 m | - | 147 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 20°F (-7°C) | 2.6 in | Coldest |
| February | 21°F (-6°C) | 2.2 in | Driest |
| March | 30°F (-1°C) | 2.4 in | |
| April | 42°F (6°C) | 3.1 in | |
| May | 55°F (13°C) | 3.4 in | |
| June | 64°F (18°C) | 3.2 in | |
| July | 68°F (20°C) | 3.8 in | Warmest, Wettest |
| August | 67°F (19°C) | 3.4 in | |
| September | 60°F (15°C) | 3.5 in | |
| October | 48°F (9°C) | 3.1 in | |
| November | 38°F (3°C) | 3.7 in | |
| December | 27°F (-3°C) | 2.9 in |
Blandford-Blenheim has a seasonal temperature swing of 49°F / from 20°F in January to 68°F in July. Total annual precipitation is 37.3 inches, with July being the wettest month (3.8") and February the driest (2.2").