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Weather & Climate in Boston Bar, BC
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Boston Bar has a cool climate with an average annual temperature of 43°F (6°C). Winters average 24°F in January while summers reach 60°F in July. The area gets 279 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 31.3 inches. The area receives 17.8 inches of snow annually, a moderate snowfall amount. The city sits at an elevation of 459 feet.
Temperature
24°F Jan (-4°C)
60°F Jul (16°C)
| Annual Average | 42.6°F |
| 21% below US avg | |
| January Average | 24°F (-4°C) |
| July Average | 60°F (16°C) |
| Sunny Days | 279 days/yr |
Geography
| Elevation | 459 ft (140 m) |
| Area | 897.7 sq mi (2,325.1 km²) |
| Population Density | 0/sq mi |
| Coordinates | 49.8700°N, 121.4440°W |
| Timezone | America/Vancouver |
Precipitation & Snow
Air Quality
Earthquake History
123 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 | 125 km | 12 km |
| Aug 17, 2002 | 39 km ESE of Merritt, Canada | M4.5 | 83 km | 10 km |
| Apr 2, 1990 | 2 km ENE of Deming, Washington | M4.3 | 127 km | 0 km |
| Feb 19, 1991 | 31 km E of Squamish, Canada | M4.3 | 94 km | 5 km |
| Apr 14, 1990 | 2 km ESE of Deming, Washington | M4.0 | 128 km | 3 km |
| Apr 3, 1990 | 3 km ENE of Deming, Washington | M4.0 | 127 km | 1 km |
| Sep 19, 1993 | 32 km ENE of Merritt, Canada | M3.8 | 85 km | 10 km |
| Jun 21, 1990 | 4 km ENE of Deming, Washington | M3.6 | 126 km | 1 km |
| May 23, 1990 | 1 km E of Deming, Washington | M3.6 | 128 km | 1 km |
| Apr 14, 1990 | 2 km E of Deming, Washington | M3.6 | 127 km | 2 km |
| Jan 12, 1997 | 15 km N of Princeton, Canada | M3.5 | 74 km | 5 km |
| Jul 31, 1990 | 3 km E of Deming, Washington | M3.5 | 127 km | 1 km |
| Apr 28, 2023 | 38 km SW of Princeton, Canada | M3.4 | 88 km | 5 km |
| Jul 19, 2025 | 34 km W of Okanagan Falls, Canada | M3.4 | 115 km | 7 km |
| Mar 8, 1992 | 27 km SW of Princeton, Canada | M3.4 | 83 km | 5 km |
| Aug 12, 2011 | 38 km NNE of Maple Ridge, Canada | M3.3 | 78 km | 20 km |
| Jul 5, 2015 | 7 km ENE of Sumas, Washington | M3.3 | 109 km | 8 km |
| Apr 21, 1990 | 4 km E of Deming, Washington | M3.3 | 127 km | 3 km |
| Jul 16, 1990 | 2 km ESE of Deming, Washington | M3.2 | 129 km | 0 km |
| Feb 6, 2005 | 32 km NE of Marblemount, Washington | M3.2 | 126 km | -1 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 | — | 61 km |
| 1905 | THOMPSON RIVER | Meteorological | 6.0 m | 15 | 62 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
7 volcanoes within 200 km. Closest: Garibaldi (112 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Garibaldi | Stratovolcano | 2,678 m (8,786 ft) | -8060 | 112 km |
| Garibaldi Lake | Volcanic field | 2,316 m (7,598 ft) | Unknown | 112 km |
| Baker | Stratovolcano(es) | 3,285 m (10,778 ft) | 1880 | 124 km |
| Cayley Volcanic Field | Volcanic field | 2,375 m (7,792 ft) | Unknown | 134 km |
| Meager | Complex | 2,680 m (8,793 ft) | -410 | 169 km |
| Bridge River Cones | Volcanic field | 2,500 m (8,202 ft) | Unknown | 173 km |
| Glacier Peak | Stratovolcano | 3,213 m (10,541 ft) | 1700 | 197 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
1 wildfire (100+ acres) recorded within 100 km. Largest: LITTLE CHILL (2,242 acres, 2022).
| Year | Name | Acres Burned | Distance |
| 2022 | LITTLE CHILL | 2,242 | 99 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 24°F (-4°C) | 4.1 in | Coldest |
| February | 30°F (-1°C) | 2.7 in | |
| March | 35°F (2°C) | 2.4 in | |
| April | 41°F (5°C) | 1.7 in | |
| May | 49°F (9°C) | 1.9 in | |
| June | 55°F (13°C) | 2.0 in | |
| July | 60°F (16°C) | 1.5 in | |
| August | 62°F (16°C) | 1.4 in | Warmest, Driest |
| September | 54°F (12°C) | 1.7 in | |
| October | 44°F (7°C) | 3.2 in | |
| November | 33°F (0°C) | 4.5 in | Wettest |
| December | 25°F (-4°C) | 4.1 in |
Boston Bar has a seasonal temperature swing of 37°F / from 24°F in January to 62°F in August. Total annual precipitation is 31.4 inches, with November being the wettest month (4.5") and August the driest (1.4").