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Weather & Climate in Siska Flat, BC
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Siska Flat has a cool climate with an average annual temperature of 42°F (6°C). Winters average 24°F in January while summers reach 60°F in July. The area gets 284 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 28.8 inches (drier than the 38-inch national average). The area receives 16.1 inches of snow annually, a moderate snowfall amount. The city sits at an elevation of 656 feet.
Temperature
24°F Jan (-5°C)
60°F Jul (15°C)
| Annual Average | 41.9°F |
| 22% below US avg | |
| January Average | 24°F (-5°C) |
| July Average | 60°F (15°C) |
| Sunny Days | 284 days/yr |
Geography
| Elevation | 656 ft (200 m) |
| Area | 0.2 sq mi (0.6 km²) |
| Population Density | 421/sq mi |
| Coordinates | 50.1355°N, 121.5713°W |
| Timezone | America/Vancouver |
Precipitation & Snow
Air Quality
Earthquake History
56 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 | 150 km | 12 km |
| Feb 21, 2025 | 28 km W of Squamish, Canada | M4.8 | 150 km | 10 km |
| Aug 17, 2002 | 39 km ESE of Merritt, Canada | M4.5 | 94 km | 10 km |
| Feb 19, 1991 | 31 km E of Squamish, Canada | M4.3 | 96 km | 5 km |
| Sep 19, 1993 | 32 km ENE of Merritt, Canada | M3.8 | 87 km | 10 km |
| Jan 12, 1997 | 15 km N of Princeton, Canada | M3.5 | 97 km | 5 km |
| Mar 8, 1992 | 27 km SW of Princeton, Canada | M3.4 | 113 km | 5 km |
| Jul 19, 2025 | 34 km W of Okanagan Falls, Canada | M3.4 | 139 km | 7 km |
| Apr 28, 2023 | 38 km SW of Princeton, Canada | M3.4 | 118 km | 5 km |
| Aug 12, 2011 | 38 km NNE of Maple Ridge, Canada | M3.3 | 89 km | 20 km |
| Jul 5, 2015 | 7 km ENE of Sumas, Washington | M3.3 | 132 km | 8 km |
| Aug 20, 2003 | 39 km ESE of Merritt, Canada | M3.2 | 94 km | 10 km |
| Aug 19, 2017 | 23 km WNW of Princeton, Canada | M3.1 | 86 km | 6 km |
| Jan 26, 2024 | 36 km WNW of Squamish, Canada | M3.1 | 148 km | 5 km |
| Jul 3, 1991 | 6 km ENE of Maple Ridge, Canada | M3.0 | 121 km | 5 km |
| Oct 6, 2001 | 8 km E of Deming, Washington | M3.0 | 149 km | 12 km |
| Aug 15, 2016 | 43 km S of Princeton, Canada | M3.0 | 139 km | 10 km |
| Apr 15, 1990 | 3 km NE of Deming, Washington | M3.0 | 150 km | 1 km |
| Feb 13, 2010 | 36 km NNE of Princeton, Canada | M3.0 | 104 km | 18 km |
| May 18, 2011 | 18 km NNE of Princeton, Canada | M3.0 | 98 km | 8 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 | — | 81 km |
| 1905 | THOMPSON RIVER | Meteorological | 6.0 m | 15 | 35 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
6 volcanoes within 200 km. Closest: Garibaldi Lake (105 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Garibaldi Lake | Volcanic field | 2,316 m (7,598 ft) | Unknown | 105 km |
| Garibaldi | Stratovolcano | 2,678 m (8,786 ft) | -8060 | 107 km |
| Cayley Volcanic Field | Volcanic field | 2,375 m (7,792 ft) | Unknown | 122 km |
| Meager | Complex | 2,680 m (8,793 ft) | -410 | 147 km |
| Bridge River Cones | Volcanic field | 2,500 m (8,202 ft) | Unknown | 149 km |
| Baker | Stratovolcano(es) | 3,285 m (10,778 ft) | 1880 | 152 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 24°F (-5°C) | 3.7 in | Coldest |
| February | 29°F (-2°C) | 2.4 in | |
| March | 34°F (1°C) | 2.2 in | |
| April | 40°F (5°C) | 1.6 in | |
| May | 48°F (9°C) | 1.9 in | |
| June | 55°F (13°C) | 1.9 in | |
| July | 60°F (15°C) | 1.5 in | |
| August | 61°F (16°C) | 1.4 in | Warmest, Driest |
| September | 53°F (12°C) | 1.6 in | |
| October | 43°F (6°C) | 2.8 in | |
| November | 32°F (0°C) | 4.1 in | Wettest |
| December | 25°F (-4°C) | 3.7 in |
Siska Flat has a seasonal temperature swing of 37°F / from 24°F in January to 61°F in August. Total annual precipitation is 28.8 inches, with November being the wettest month (4.1") and August the driest (1.4").