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Weather & Climate in Saint-Mathias-sur-Richelieu, QC
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Saint-Mathias-sur-Richelieu has a cool climate with an average annual temperature of 43°F (6°C). Winters average 13°F in January while summers reach 69°F in July. The area gets 263 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 40.2 inches. The area receives 14.8 inches of snow annually. The city sits at an elevation of 39 feet.
Temperature
13°F Jan (-10°C)
69°F Jul (21°C)
| Annual Average | 43.0°F |
| 20% below US avg | |
| January Average | 13°F (-10°C) |
| July Average | 69°F (21°C) |
| Sunny Days | 263 days/yr |
Geography
| Elevation | 39 ft (12 m) |
| Area | 18.2 sq mi (47.0 km²) |
| Population Density | 250/sq mi |
| Coordinates | 45.4668°N, 73.2659°W |
| Timezone | America/Montreal |
Precipitation & Snow
Air Quality
Earthquake History
110 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 | 111 km | 5 km |
| Mar 14, 1996 | 7 km WNW of Saint-Adolphe-d'Howard, Canada | M4.5 | 108 km | 18 km |
| May 17, 1991 | 7 km WNW of Rigaud, Canada | M4.4 | 89 km | 18 km |
| May 24, 1997 | 6 km W of Saint-Adolphe-d'Howard, Canada | M4.2 | 106 km | 10 km |
| Oct 31, 1999 | 7 km SW of Morin-Heights, Canada | M4.2 | 92 km | 18 km |
| Apr 18, 1998 | 4 km N of Plantagenet, Canada | M4.1 | 135 km | 18 km |
| Nov 17, 1992 | 16 km ENE of Saint-André-Avellin, Canada | M4.0 | 129 km | 18 km |
| Oct 10, 2012 | 7 km ESE of Verchères, Canada | M3.9 | 32 km | 9 km |
| Jul 30, 1993 | 1 km NE of Salaberry-de-Valleyfield, Canada | M3.9 | 71 km | 8 km |
| Mar 16, 2011 | 6 km ENE of Hawkesbury, Canada | M3.9 | 100 km | 10 km |
| Jul 30, 1998 | 0 km ENE of Lac-Simon, Canada | M3.8 | 137 km | 10 km |
| Oct 6, 2000 | 1 km WSW of Ormstown, Canada | M3.8 | 70 km | 18 km |
| Sep 23, 1993 | 11 km SE of La Conception, Canada | M3.8 | 123 km | 18 km |
| Nov 16, 1993 | 5 km SSE of Saint-Édouard, Canada | M3.8 | 36 km | 17 km |
| Jul 5, 1991 | 7 km WSW of Sainte-Martine, Canada | M3.8 | 56 km | 18 km |
| Feb 11, 2002 | 2 km WNW of Notre-Dame-des-Prairies, Canada | M3.8 | 68 km | 10 km |
| Sep 1, 2024 | 5 km SE of Pierreville, Canada | M3.8 | 75 km | 1 km |
| Nov 6, 2012 | Ontario-Quebec border region, Canada | M3.7 | 105 km | 11 km |
| Jan 9, 2006 | 2 km ESE of Franklin, Canada | M3.7 | 69 km | 13 km |
| Apr 8, 2003 | 17 km ESE of Saint Regis Falls, New York | M3.7 | 127 km | 10 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 | 73 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 13°F (-10°C) | 2.8 in | Coldest |
| February | 16°F (-9°C) | 2.3 in | Driest |
| March | 27°F (-3°C) | 2.6 in | |
| April | 42°F (5°C) | 3.2 in | |
| May | 55°F (13°C) | 3.4 in | |
| June | 65°F (18°C) | 3.7 in | |
| July | 69°F (21°C) | 4.0 in | Warmest, Wettest |
| August | 67°F (20°C) | 3.9 in | |
| September | 59°F (15°C) | 3.7 in | |
| October | 47°F (8°C) | 3.6 in | |
| November | 36°F (2°C) | 3.7 in | |
| December | 21°F (-6°C) | 3.4 in |
Saint-Mathias-sur-Richelieu has a seasonal temperature swing of 56°F / from 13°F in January to 69°F in July. Total annual precipitation is 40.2 inches, with July being the wettest month (4.0") and February the driest (2.3").