Weather & Climate in Waltham, QC
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Waltham has a cool climate with an average annual temperature of 40°F (4°C). Winters average 8°F in January while summers reach 66°F in July. Annual precipitation totals 36.4 inches. The area receives 13.1 inches of snow annually. The city sits at an elevation of 371 feet.
Temperature
8°F Jan (-13°C)
66°F Jul (19°C)
| Annual Average | 39.5°F |
| 27% below US avg | |
| January Average | 8°F (-13°C) |
| July Average | 66°F (19°C) |
Geography
| Elevation | 371 ft (113 m) |
| Area | 139.1 sq mi (360.2 km²) |
| Population Density | 3/sq mi |
| Coordinates | 45.9072°N, 76.9084°W |
| Timezone | America/Montreal |
Precipitation & Snow
Air Quality
Earthquake History
105 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 | 111 km | 19 km |
| May 17, 2013 | 20 km NNE of Shawville, Canada | M5.1 | 46 km | 13 km |
| Oct 19, 1990 | 11 km SW of Mont-Laurier, Canada | M4.6 | 119 km | 13 km |
| Jun 16, 1991 | 78 km NW of Saint-Boniface, Canada | M4.5 | 123 km | 18 km |
| Dec 25, 1993 | 9 km WSW of Mont-Laurier, Canada | M4.3 | 120 km | 18 km |
| Oct 12, 2003 | 63 km NNW of Saint-Boniface, Canada | M4.2 | 129 km | 18 km |
| Nov 15, 1990 | 72 km NNW of Saint-Boniface, Canada | M4.1 | 146 km | 18 km |
| Feb 25, 2006 | 4 km NE of Thurso, Canada | M4.0 | 136 km | 11 km |
| Oct 7, 1990 | 21 km WNW of La Minerve, Canada | M3.9 | 140 km | 18 km |
| Mar 19, 2001 | 65 km NNW of Saint-Boniface, Canada | M3.9 | 136 km | 18 km |
| Mar 6, 1991 | 49 km NNW of Fort-Coulonge, Canada | M3.9 | 42 km | 18 km |
| Sep 18, 2011 | 1 km E of Thurso, Canada | M3.8 | 134 km | 5 km |
| Feb 26, 1998 | 33 km SW of Saint-Raphaël, Canada | M3.7 | 46 km | 18 km |
| Sep 7, 2002 | southern Quebec, Canada | M3.7 | 126 km | 18 km |
| Jul 13, 2019 | 78 km NNW of Saint-Boniface, Canada | M3.7 | 147 km | 15 km |
| May 17, 2013 | 20 km NNE of Shawville, Canada | M3.6 | 46 km | 11 km |
| May 9, 2020 | 46 km NW of Ferme-Neuve, Canada | M3.6 | 147 km | 16 km |
| Oct 20, 2013 | 34 km SSW of Petawawa, Canada | M3.6 | 54 km | 18 km |
| May 6, 1993 | 27 km S of Mont-Laurier, Canada | M3.5 | 117 km | 18 km |
| May 14, 2016 | 8 km NW of Petawawa, Canada | M3.5 | 35 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 | 103 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 8°F (-13°C) | 2.5 in | Coldest |
| February | 11°F (-11°C) | 2.1 in | Driest |
| March | 23°F (-5°C) | 2.5 in | |
| April | 38°F (3°C) | 2.6 in | |
| May | 52°F (11°C) | 3.4 in | |
| June | 61°F (16°C) | 3.2 in | |
| July | 66°F (19°C) | 3.3 in | Warmest |
| August | 65°F (18°C) | 3.9 in | Wettest |
| September | 56°F (13°C) | 3.5 in | |
| October | 45°F (7°C) | 3.5 in | |
| November | 33°F (0°C) | 3.2 in | |
| December | 17°F (-8°C) | 2.8 in |
Waltham has a seasonal temperature swing of 58°F / from 8°F in January to 66°F in July. Total annual precipitation is 36.4 inches, with August being the wettest month (3.9") and February the driest (2.1").