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Weather & Climate in Promontory, BC
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Promontory experiences four distinct seasons with an average annual temperature of 51°F (11°C). Winters average 39°F in January while summers reach 67°F in July. The area gets 222 sunny days per year, above the national average. Annual precipitation totals 54.6 inches (wetter than the 38-inch national average). The area receives 35.2 inches of snow annually, a moderate snowfall amount. The city sits at an elevation of 354 feet.
Temperature
39°F Jan (4°C)
67°F Jul (20°C)
| Annual Average | 51.1°F |
| 5% below US avg | |
| January Average | 39°F (4°C) |
| July Average | 67°F (20°C) |
| Sunny Days | 222 days/yr |
Geography
| Elevation | 354 ft (108 m) |
| Area | 127.5 sq mi (330.2 km²) |
| Population Density | 93/sq mi |
| Coordinates | 49.1035°N, 121.9352°W |
| Timezone | America/Vancouver |
Precipitation & Snow
Air Quality
Earthquake History
384 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.4.
| May 3, 1996 | 8 km NNE of Lake Marcel-Stillwater, Washington | M5.4 | 149 km | 4 km |
| Apr 14, 1990 | 4 km ENE of Deming, Washington | M5.0 | 33 km | 12 km |
| Feb 21, 2025 | 28 km W of Squamish, Canada | M4.8 | 134 km | 10 km |
| Jul 12, 2019 | 2 km S of Roosevelt, Washington | M4.6 | 137 km | 29 km |
| Mar 3, 2025 | 2025 Orcas Island, Washington | M4.5 | 84 km | 16 km |
| Jun 24, 1997 | 19 km SSW of Gibsons, Canada | M4.4 | 124 km | 3 km |
| Feb 19, 1991 | 31 km E of Squamish, Canada | M4.3 | 87 km | 5 km |
| Apr 2, 1990 | 2 km ENE of Deming, Washington | M4.3 | 35 km | 0 km |
| Sep 21, 2002 | 9 km SW of Friday Harbor, Washington | M4.1 | 111 km | 23 km |
| Apr 3, 1990 | 3 km ENE of Deming, Washington | M4.0 | 35 km | 1 km |
| Apr 14, 1990 | 2 km ESE of Deming, Washington | M4.0 | 36 km | 3 km |
| Sep 26, 2024 | 12 km E of Saanichton, Canada | M4.0 | 112 km | 52 km |
| Dec 27, 2012 | 12 km E of North Saanich, Canada | M4.0 | 109 km | 54 km |
| Jul 1, 2009 | 4 km SE of Coupeville, Washington | M4.0 | 114 km | 58 km |
| Mar 17, 2004 | 3 km SW of Clear Lake, Washington | M3.8 | 77 km | 0 km |
| Dec 11, 1999 | 10 km NNE of Oak Bay, Canada | M3.7 | 115 km | 49 km |
| Feb 14, 2025 | 16 km SSE of Victoria, Canada | M3.7 | 134 km | 40 km |
| Feb 8, 2011 | 7 km WNW of Friday Harbor, Washington | M3.6 | 105 km | 52 km |
| Jun 21, 1990 | 4 km ENE of Deming, Washington | M3.6 | 34 km | 1 km |
| Apr 14, 1990 | 2 km E of Deming, Washington | M3.6 | 35 km | 2 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 | — | 41 km |
| 1820 | CAMANO ISLAND, WA | Meteorological | — | — | 120 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
5 volcanoes within 200 km. Closest: Baker (37 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Baker | Stratovolcano(es) | 3,285 m (10,778 ft) | 1880 | 37 km |
| Garibaldi | Stratovolcano | 2,678 m (8,786 ft) | -8060 | 113 km |
| Garibaldi Lake | Volcanic field | 2,316 m (7,598 ft) | Unknown | 120 km |
| Glacier Peak | Stratovolcano | 3,213 m (10,541 ft) | 1700 | 126 km |
| Cayley Volcanic Field | Volcanic field | 2,375 m (7,792 ft) | Unknown | 149 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
18 wildfires (100+ acres) recorded within 100 km. Largest: TATOOSH COMPLEX (48,862 acres, 2006).
| Year | Name | Acres Burned | Distance |
| 2006 | TATOOSH COMPLEX | 48,862 | 99 km |
| 2022 | PARKS | 34,621 | 92 km |
| 2023 | SOURDOUGH | 7,517 | 70 km |
| 2015 | GOODELL | 6,624 | 70 km |
| 2022 | KID | 5,188 | 95 km |
| 2022 | SUIATTLE RIVER | 4,400 | 99 km |
| 2022 | COPPER LAKE | 3,825 | 41 km |
| 1996 | ELBOW BASIN | 3,650 | 82 km |
| 2022 | BRUSH CREEK 2 | 3,186 | 46 km |
| 2003 | MINERAL PARK | 3,010 | 95 km |
| 2022 | SILESIA | 2,737 | 36 km |
| 2022 | MCALLISTER CREEK | 2,581 | 81 km |
| 2022 | THREE FOOLS | 2,451 | 78 km |
| 2022 | BOULDER LAKE | 2,347 | 95 km |
| 2022 | LITTLE CHILL | 2,242 | 37 km |
| 2003 | BIGBEAVER | 1,807 | 69 km |
| 1998 | UNNAMED | 1,174 | 76 km |
| 2004 | FREEZEOUT | 1,155 | 73 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 39°F (4°C) | 8.9 in | |
| February | 37°F (3°C) | 6.0 in | |
| March | 41°F (5°C) | 5.8 in | |
| April | 46°F (8°C) | 4.7 in | |
| May | 52°F (11°C) | 3.8 in | |
| June | 57°F (14°C) | 3.4 in | |
| July | 67°F (20°C) | 2.3 in | Warmest |
| August | 63°F (17°C) | 2.2 in | Driest |
| September | 57°F (14°C) | 3.2 in | |
| October | 48°F (9°C) | 6.5 in | |
| November | 40°F (4°C) | 10.1 in | Wettest |
| December | 34°F (1°C) | 8.4 in | Coldest |
Promontory has a seasonal temperature swing of 33°F / from 34°F in December to 67°F in July. Total annual precipitation is 65.2 inches, with November being the wettest month (10.1") and August the driest (2.2").