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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. The area gets 270 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 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) |
| Sunny Days | 270 days/yr |
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").