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Weather & Climate in Beauharnois, QC
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Beauharnois experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 25°F in January while summers reach 72°F in July. The area gets 233 sunny days per year, above the national average. Annual precipitation totals 50.9 inches (wetter than the 38-inch national average). The area receives 64.3 inches of snow annually, making winter weather a significant factor for residents. The city sits at an elevation of 92 feet.
Temperature
25°F Jan (-4°C)
72°F Jul (22°C)
| Annual Average | 47.5°F |
| 12% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 233 days/yr |
Geography
| Elevation | 92 ft (28 m) |
| Area | 26.3 sq mi (68.2 km²) |
| Population Density | 518/sq mi |
| Coordinates | 45.3134°N, 73.8725°W |
| Timezone | America/Toronto |
Precipitation & Snow
Air Quality
Earthquake History
163 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.4.
| Jun 23, 2010 | 29 km NNE of Val-des-Monts, Canada | M5.4 | 140 km | 19 km |
| Apr 20, 2002 | 8 km NNW of Au Sable Forks, New York | M5.3 | 90 km | 5 km |
| Mar 14, 1996 | 7 km WNW of Saint-Adolphe-d'Howard, Canada | M4.5 | 87 km | 18 km |
| May 17, 1991 | 7 km WNW of Rigaud, Canada | M4.4 | 46 km | 18 km |
| Oct 31, 1999 | 7 km SW of Morin-Heights, Canada | M4.2 | 69 km | 18 km |
| May 24, 1997 | 6 km W of Saint-Adolphe-d'Howard, Canada | M4.2 | 85 km | 10 km |
| Apr 18, 1998 | 4 km N of Plantagenet, Canada | M4.1 | 92 km | 18 km |
| Aug 6, 2000 | 7 km SSW of La Minerve, Canada | M4.0 | 129 km | 18 km |
| Nov 17, 1992 | 16 km ENE of Saint-André-Avellin, Canada | M4.0 | 92 km | 18 km |
| Feb 25, 2006 | 4 km NE of Thurso, Canada | M4.0 | 109 km | 11 km |
| Oct 10, 2012 | 7 km ESE of Verchères, Canada | M3.9 | 68 km | 9 km |
| Jul 30, 1993 | 1 km NE of Salaberry-de-Valleyfield, Canada | M3.9 | 20 km | 8 km |
| Mar 16, 2011 | 6 km ENE of Hawkesbury, Canada | M3.9 | 62 km | 10 km |
| Sep 18, 2011 | 1 km E of Thurso, Canada | M3.8 | 111 km | 5 km |
| Jul 30, 1998 | 0 km ENE of Lac-Simon, Canada | M3.8 | 115 km | 10 km |
| Feb 11, 2002 | 2 km WNW of Notre-Dame-des-Prairies, Canada | M3.8 | 89 km | 10 km |
| Nov 16, 1993 | 5 km SSE of Saint-Édouard, Canada | M3.8 | 33 km | 17 km |
| Sep 23, 1993 | 11 km SE of La Conception, Canada | M3.8 | 101 km | 18 km |
| Jul 5, 1991 | 7 km WSW of Sainte-Martine, Canada | M3.8 | 9 km | 18 km |
| Oct 6, 2000 | 1 km WSW of Ormstown, Canada | M3.8 | 23 km | 18 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 15.0 m (49 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1908 | NOTRE DAME DE LA SALETTE | Meteorological | 15.0 m | 33 | 144 km |
Source: NOAA/NCEI Historical Tsunami Database.
Wildfire History
1 wildfire (100+ acres) recorded within 100 km. Largest: FLAT ROCK FIRE (658 acres, 2018).
| Year | Name | Acres Burned | Distance |
| 2018 | FLAT ROCK FIRE | 658 | 53 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 25°F (-4°C) | 2.7 in | |
| February | 16°F (-9°C) | 2.3 in | Coldest, Driest |
| March | 27°F (-3°C) | 2.5 in | |
| April | 42°F (5°C) | 3.1 in | |
| May | 56°F (13°C) | 3.3 in | |
| June | 65°F (18°C) | 3.6 in | |
| July | 72°F (22°C) | 3.7 in | Warmest, Wettest |
| August | 67°F (20°C) | 3.7 in | |
| September | 59°F (15°C) | 3.5 in | |
| October | 47°F (9°C) | 3.5 in | |
| November | 36°F (2°C) | 3.5 in | |
| December | 22°F (-6°C) | 3.1 in |
Beauharnois has a seasonal temperature swing of 56°F / from 16°F in February to 72°F in July. Total annual precipitation is 38.4 inches, with July being the wettest month (3.7") and February the driest (2.3").