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Weather & Climate in Altamont, BC
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Altamont has a cool climate with an average annual temperature of 43°F (6°C). Winters average 31°F in January while summers reach 59°F in July. The area gets 211 sunny days per year. Annual precipitation totals 116.3 inches (wetter than the 38-inch national average). The area receives 335.3 inches of snow annually, making winter weather a significant factor for residents. The city sits at an elevation of 121 feet.
Temperature
31°F Jan (-0°C)
59°F Jul (15°C)
| Annual Average | 43.1°F |
| 20% below US avg | |
| January Average | 31°F (-0°C) |
| July Average | 59°F (15°C) |
| Sunny Days | 211 days/yr |
Geography
| Elevation | 121 ft (37 m) |
| Area | 35.7 sq mi (92.3 km²) |
| Population Density | 30/sq mi |
| Coordinates | 49.3408°N, 123.2025°W |
| Timezone | America/Vancouver |
Precipitation & Snow
Air Quality
Earthquake History
267 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.0.
| Apr 14, 1990 | 4 km ENE of Deming, Washington | M5.0 | 94 km | 12 km |
| Feb 21, 2025 | 28 km W of Squamish, Canada | M4.8 | 46 km | 10 km |
| Mar 3, 2025 | 2025 Orcas Island, Washington | M4.5 | 86 km | 16 km |
| Jun 24, 1997 | 19 km SSW of Gibsons, Canada | M4.4 | 33 km | 3 km |
| Feb 19, 1991 | 31 km E of Squamish, Canada | M4.3 | 52 km | 5 km |
| Apr 2, 1990 | 2 km ENE of Deming, Washington | M4.3 | 93 km | 0 km |
| Sep 21, 2002 | 9 km SW of Friday Harbor, Washington | M4.1 | 95 km | 23 km |
| Feb 22, 1996 | 31 km NNE of South Pender Harbour, Canada | M4.1 | 80 km | 2 km |
| Apr 3, 1990 | 3 km ENE of Deming, Washington | M4.0 | 94 km | 1 km |
| Apr 14, 1990 | 2 km ESE of Deming, Washington | M4.0 | 94 km | 3 km |
| Dec 27, 2012 | 12 km E of North Saanich, Canada | M4.0 | 77 km | 54 km |
| Sep 26, 2024 | 12 km E of Saanichton, Canada | M4.0 | 85 km | 52 km |
| Jul 1, 2009 | 4 km SE of Coupeville, Washington | M4.0 | 134 km | 58 km |
| Apr 7, 2001 | 36 km NNW of Neah Bay, Washington | M3.9 | 133 km | 32 km |
| Mar 17, 2004 | 3 km SW of Clear Lake, Washington | M3.8 | 121 km | 0 km |
| Aug 19, 2025 | 17 km NNW of Sekiu, Washington | M3.7 | 135 km | 38 km |
| Dec 11, 1999 | 10 km NNE of Oak Bay, Canada | M3.7 | 90 km | 49 km |
| Feb 14, 2025 | 16 km SSE of Victoria, Canada | M3.7 | 117 km | 40 km |
| Feb 8, 2011 | 7 km WNW of Friday Harbor, Washington | M3.6 | 87 km | 52 km |
| Jul 4, 2006 | 13 km SE of Oak Bay, Canada | M3.6 | 110 km | 45 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
2 tsunamis recorded within 500 km. Highest wave on record: 38.0 m (125 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 2007 | CHEHALIS LAKE, CHILLIWACK | Meteorological | 38.0 m | — | 87 km |
| 1946 | BRITISH COLUMBIA | Eruption + Earthquake | 9.0 m | 1 | 137 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
6 volcanoes within 200 km. Closest: Garibaldi (59 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Garibaldi | Stratovolcano | 2,678 m (8,786 ft) | -8060 | 59 km |
| Garibaldi Lake | Volcanic field | 2,316 m (7,598 ft) | Unknown | 67 km |
| Cayley Volcanic Field | Volcanic field | 2,375 m (7,792 ft) | Unknown | 87 km |
| Baker | Stratovolcano(es) | 3,285 m (10,778 ft) | 1880 | 119 km |
| Meager | Complex | 2,680 m (8,793 ft) | -410 | 145 km |
| Bridge River Cones | Volcanic field | 2,500 m (8,202 ft) | Unknown | 163 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 31°F (-0°C) | 10.7 in | Coldest |
| February | 35°F (2°C) | 7.2 in | |
| March | 37°F (3°C) | 7.1 in | |
| April | 42°F (5°C) | 5.6 in | |
| May | 48°F (9°C) | 4.2 in | |
| June | 53°F (11°C) | 3.4 in | |
| July | 59°F (15°C) | 2.2 in | Warmest, Driest |
| August | 59°F (15°C) | 2.5 in | |
| September | 54°F (12°C) | 3.0 in | |
| October | 46°F (8°C) | 8.2 in | |
| November | 38°F (3°C) | 12.4 in | Wettest |
| December | 33°F (1°C) | 10.1 in |
Altamont has a seasonal temperature swing of 28°F / from 31°F in January to 59°F in July. Total annual precipitation is 76.7 inches, with November being the wettest month (12.4") and July the driest (2.2").