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Weather & Climate in Glenrosa, BC
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Glenrosa experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 30°F in January while summers reach 70°F in July. The area gets 259 sunny days per year, above the national average. Annual precipitation totals 14.2 inches (drier than the 38-inch national average). The area receives 29.4 inches of snow annually, a moderate snowfall amount. The city sits at an elevation of 1,916 feet.
Temperature
30°F Jan (-1°C)
70°F Jul (21°C)
| Annual Average | 48.8°F |
| 10% below US avg | |
| January Average | 30°F (-1°C) |
| July Average | 70°F (21°C) |
| Sunny Days | 259 days/yr |
Geography
| Elevation | 1,916 ft (584 m) |
| Area | 67.8 sq mi (175.7 km²) |
| Population Density | 89/sq mi |
| Coordinates | 49.8500°N, 119.6667°W |
| Timezone | America/Vancouver |
Precipitation & Snow
Air Quality
Earthquake History
80 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.5.
| Aug 17, 2002 | 39 km ESE of Merritt, Canada | M4.5 | 46 km | 10 km |
| Sep 10, 2016 | 23 km E of Oliver, Canada | M3.9 | 78 km | 1 km |
| Sep 19, 1993 | 32 km ENE of Merritt, Canada | M3.8 | 61 km | 10 km |
| Mar 3, 1998 | 16 km NNE of Grand Forks, Canada | M3.8 | 122 km | 5 km |
| Jan 26, 1992 | 9 km SSE of Okanagan Falls, Canada | M3.7 | 65 km | 10 km |
| Jan 12, 1997 | 15 km N of Princeton, Canada | M3.5 | 66 km | 5 km |
| Apr 28, 2023 | 38 km SW of Princeton, Canada | M3.4 | 112 km | 5 km |
| Mar 8, 1992 | 27 km SW of Princeton, Canada | M3.4 | 101 km | 5 km |
| Jul 19, 2025 | 34 km W of Okanagan Falls, Canada | M3.4 | 58 km | 7 km |
| Apr 20, 2025 | 8 km NW of Tonasket, Washington | M3.2 | 121 km | 15 km |
| Mar 3, 1998 | 15 km NNE of Grand Forks, Canada | M3.2 | 125 km | 5 km |
| Aug 20, 2003 | 39 km ESE of Merritt, Canada | M3.2 | 46 km | 10 km |
| Apr 13, 2025 | 7 km NW of Tonasket, Washington | M3.2 | 122 km | 15 km |
| May 28, 2022 | 55 km NE of Marblemount, Washington | M3.2 | 143 km | 0 km |
| May 15, 2025 | 9 km NW of Tonasket, Washington | M3.1 | 120 km | 15 km |
| Apr 13, 2025 | 6 km NW of Tonasket, Washington | M3.1 | 122 km | 15 km |
| Aug 19, 2017 | 23 km WNW of Princeton, Canada | M3.1 | 89 km | 6 km |
| Nov 25, 2000 | 13 km SSE of Oroville, Washington | M3.1 | 115 km | 1 km |
| Apr 16, 2025 | 9 km NW of Tonasket, Washington | M3.1 | 121 km | 15 km |
| May 18, 2011 | 18 km NNE of Princeton, Canada | M3.0 | 62 km | 8 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 6.0 m (20 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1905 | THOMPSON RIVER | Meteorological | 6.0 m | 15 | 136 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
1 volcano within 200 km. Closest: Baker (196 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Baker | Stratovolcano(es) | 3,285 m (10,778 ft) | 1880 | 196 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
5 wildfires (100+ acres) recorded within 100 km. Largest: UNNAMED (8,385 acres, 1994).
| Year | Name | Acres Burned | Distance |
| 1994 | UNNAMED | 8,385 | 92 km |
| 2015 | NEWBY LAKE | 5,794 | 99 km |
| 2023 | CRATER CREEK | 4,837 | 99 km |
| 2007 | LITTLE CHOPAKA | 4,406 | 98 km |
| 1994 | UNNAMED | 3,324 | 98 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 30°F (-1°C) | 2.1 in | |
| February | 24°F (-4°C) | 1.5 in | |
| March | 30°F (-1°C) | 1.4 in | |
| April | 38°F (3°C) | 1.3 in | Driest |
| May | 46°F (8°C) | 2.0 in | |
| June | 52°F (11°C) | 2.4 in | Wettest |
| July | 70°F (21°C) | 2.0 in | Warmest |
| August | 58°F (15°C) | 1.6 in | |
| September | 51°F (10°C) | 1.5 in | |
| October | 40°F (4°C) | 1.4 in | |
| November | 28°F (-3°C) | 2.2 in | |
| December | 20°F (-7°C) | 2.4 in | Coldest |
Glenrosa has a seasonal temperature swing of 51°F / from 20°F in December to 70°F in July. Total annual precipitation is 21.7 inches, with June being the wettest month (2.4") and April the driest (1.3").