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Weather & Climate in Lac-Brome, QC
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Lac-Brome experiences four distinct seasons with an average annual temperature of 46°F (8°C). Winters average 25°F in January while summers reach 70°F in July. The area gets 225 sunny days per year, above the national average. Annual precipitation totals 58.3 inches (wetter than the 38-inch national average). The area receives 86.2 inches of snow annually, making winter weather a significant factor for residents. The city sits at an elevation of 686 feet.
Temperature
25°F Jan (-4°C)
70°F Jul (21°C)
| Annual Average | 46.0°F |
| 15% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 70°F (21°C) |
| Sunny Days | 225 days/yr |
Geography
| Elevation | 686 ft (209 m) |
| Area | 79.9 sq mi (206.9 km²) |
| Population Density | 74/sq mi |
| Coordinates | 45.2168°N, 72.5158°W |
| Timezone | America/Toronto |
Precipitation & Snow
Air Quality
Earthquake History
64 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.3.
| Apr 20, 2002 | 8 km NNW of Au Sable Forks, New York | M5.3 | 122 km | 5 km |
| Oct 10, 2012 | 7 km ESE of Verchères, Canada | M3.9 | 84 km | 9 km |
| Jul 30, 1993 | 1 km NE of Salaberry-de-Valleyfield, Canada | M3.9 | 126 km | 8 km |
| Sep 1, 2024 | 5 km SE of Pierreville, Canada | M3.8 | 94 km | 1 km |
| Nov 16, 1993 | 5 km SSE of Saint-Édouard, Canada | M3.8 | 77 km | 17 km |
| Feb 11, 2002 | 2 km WNW of Notre-Dame-des-Prairies, Canada | M3.8 | 119 km | 10 km |
| Oct 6, 2000 | 1 km WSW of Ormstown, Canada | M3.8 | 118 km | 18 km |
| Jul 5, 1991 | 7 km WSW of Sainte-Martine, Canada | M3.8 | 108 km | 18 km |
| Jun 16, 1995 | 8 km N of Lisbon, New Hampshire | M3.8 | 114 km | 5 km |
| Aug 21, 1996 | 12 km N of Livermore, New Hampshire | M3.8 | 147 km | 10 km |
| Jan 9, 2006 | 2 km ESE of Franklin, Canada | M3.7 | 109 km | 13 km |
| Apr 20, 2002 | 5 km NNW of Au Sable Forks, New York | M3.7 | 123 km | 5 km |
| Apr 3, 1997 | 9 km ENE of Saint-Cyrille-de-Wendover, Canada | M3.5 | 86 km | 5 km |
| Apr 8, 2005 | 6 km SW of Saint-Gabriel, Canada | M3.4 | 137 km | 18 km |
| Jan 13, 2020 | 5 km SW of Franklin, Canada | M3.4 | 117 km | 6 km |
| Jun 9, 1998 | 3 km N of Dannemora, New York | M3.3 | 108 km | 5 km |
| May 17, 2021 | 5 km SW of L'Épiphanie, Canada | M3.3 | 103 km | 12 km |
| Aug 20, 1995 | 4 km S of Chambly, Canada | M3.3 | 64 km | 18 km |
| Jun 1, 2002 | 3 km SW of Boisbriand, Canada | M3.2 | 113 km | 18 km |
| Feb 1, 2024 | 6 km WNW of Huntingdon, Canada | M3.1 | 137 km | 8 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
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 | 96 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 25°F (-4°C) | 3.8 in | |
| February | 15°F (-9°C) | 3.0 in | Coldest, Driest |
| March | 26°F (-3°C) | 3.4 in | |
| April | 40°F (4°C) | 3.7 in | |
| May | 53°F (12°C) | 4.2 in | |
| June | 62°F (17°C) | 4.5 in | |
| July | 70°F (21°C) | 5.0 in | Warmest, Wettest |
| August | 65°F (18°C) | 4.9 in | |
| September | 57°F (14°C) | 4.3 in | |
| October | 45°F (7°C) | 4.5 in | |
| November | 34°F (1°C) | 4.4 in | |
| December | 20°F (-7°C) | 4.3 in |
Lac-Brome has a seasonal temperature swing of 54°F / from 15°F in February to 70°F in July. Total annual precipitation is 49.9 inches, with July being the wettest month (5.0") and February the driest (3.0").