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Weather & Climate in Mill Bay, BC
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Mill Bay experiences four distinct seasons with an average annual temperature of 53°F (12°C). Winters average 41°F in January while summers reach 71°F in July. The area gets 236 sunny days per year, above the national average. Annual precipitation totals 40.3 inches. The area receives 25.6 inches of snow annually, a moderate snowfall amount.
Temperature
41°F Jan (5°C)
71°F Jul (21°C)
| Annual Average | 53.0°F |
| 2% below US avg | |
| January Average | 41°F (5°C) |
| July Average | 71°F (21°C) |
| Sunny Days | 236 days/yr |
Geography
| Area | 25.9 sq mi (67.2 km²) |
| Population Density | 278/sq mi |
| Coordinates | 48.6500°N, 123.5500°W |
| Timezone | America/Vancouver |
Precipitation & Snow
Air Quality
Earthquake History
497 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 | 104 km | 12 km |
| Jun 23, 1997 | 2 km NE of Enetai, Washington | M4.9 | 138 km | 13 km |
| Apr 25, 2003 | 26 km W of Brinnon, Washington | M4.8 | 111 km | 51 km |
| Feb 21, 2025 | 28 km W of Squamish, Canada | M4.8 | 116 km | 10 km |
| Jan 30, 2009 | 6 km ESE of Lofall, Washington | M4.7 | 120 km | 62 km |
| Jul 12, 2019 | 2 km S of Roosevelt, Washington | M4.6 | 143 km | 29 km |
| Mar 3, 2025 | 2025 Orcas Island, Washington | M4.5 | 55 km | 16 km |
| Jan 24, 2020 | 46 km WNW of Neah Bay, Washington | M4.5 | 121 km | 10 km |
| Jun 24, 1997 | 19 km SSW of Gibsons, Canada | M4.4 | 66 km | 3 km |
| Feb 19, 1991 | 31 km E of Squamish, Canada | M4.3 | 131 km | 5 km |
| Apr 2, 1990 | 2 km ENE of Deming, Washington | M4.3 | 102 km | 0 km |
| Feb 22, 1996 | 31 km NNE of South Pender Harbour, Canada | M4.1 | 141 km | 2 km |
| Sep 21, 2002 | 9 km SW of Friday Harbor, Washington | M4.1 | 36 km | 23 km |
| Feb 23, 2017 | 11 km NE of Hoodsport, Washington | M4.1 | 136 km | 15 km |
| Apr 14, 1990 | 2 km ESE of Deming, Washington | M4.0 | 102 km | 3 km |
| Apr 3, 1990 | 3 km ENE of Deming, Washington | M4.0 | 103 km | 1 km |
| Jun 15, 1994 | 1 km WNW of Hoodsport, Washington | M4.0 | 141 km | 44 km |
| Sep 26, 2024 | 12 km E of Saanichton, Canada | M4.0 | 24 km | 52 km |
| Dec 27, 2012 | 12 km E of North Saanich, Canada | M4.0 | 22 km | 54 km |
| Jul 1, 2009 | 4 km SE of Coupeville, Washington | M4.0 | 84 km | 58 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
3 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 | — | 144 km |
| 1891 | WASHINGTON | Eruption + Earthquake | 2.4 m | — | 72 km |
| 1820 | CAMANO ISLAND, WA | Meteorological | — | — | 110 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
5 volcanoes within 200 km. Closest: Baker (128 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Baker | Stratovolcano(es) | 3,285 m (10,778 ft) | 1880 | 128 km |
| Garibaldi | Stratovolcano | 2,678 m (8,786 ft) | -8060 | 139 km |
| Garibaldi Lake | Volcanic field | 2,316 m (7,598 ft) | Unknown | 148 km |
| Cayley Volcanic Field | Volcanic field | 2,375 m (7,792 ft) | Unknown | 165 km |
| Glacier Peak | Stratovolcano | 3,213 m (10,541 ft) | 1700 | 190 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
2 wildfires (100+ acres) recorded within 100 km. Largest: DELABARRE (4,176 acres, 2023).
| Year | Name | Acres Burned | Distance |
| 2023 | DELABARRE | 4,176 | 98 km |
| 2016 | HAYES TWO | 2,679 | 95 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 41°F (5°C) | 8.5 in | |
| February | 39°F (4°C) | 5.6 in | |
| March | 41°F (5°C) | 4.8 in | |
| April | 45°F (7°C) | 3.2 in | |
| May | 51°F (11°C) | 2.1 in | |
| June | 56°F (13°C) | 1.7 in | |
| July | 71°F (21°C) | 1.0 in | Warmest, Driest |
| August | 61°F (16°C) | 1.4 in | |
| September | 57°F (14°C) | 1.6 in | |
| October | 49°F (9°C) | 4.8 in | |
| November | 41°F (5°C) | 8.6 in | Wettest |
| December | 37°F (3°C) | 8.5 in | Coldest |
Mill Bay has a seasonal temperature swing of 34°F / from 37°F in December to 71°F in July. Total annual precipitation is 51.8 inches, with November being the wettest month (8.6") and July the driest (1.0").