Sion, BC

Full City Profile · British Columbia

658 Population 1/sq mi density
43°F Avg Temperature
Sion has a cool climate with an average annual temperature of 43°F (6°C). Winters average 22°F in January while summers reach 64°F in July. Annual precipitation totals 22.3 inches. The area receives 10.3 inches of snow annually.

Temperature

22°F Jan (-5°C) 64°F Jul (18°C)
Annual Average43.4°F
20% below US avg
January Average22°F (-5°C)
July Average64°F (18°C)

Geography

Elevation1,795 ft (547 m)
Area817.7 sq mi (2,117.9 km²)
Population Density1/sq mi
Coordinates49.0168°N, 118.4921°W
TimezoneAmerica/Vancouver

Precipitation & Snow

Annual Rainfall 22.3"
41% below US avg
Snowfall 10.3"
Wettest Month (Dec) 2.56"
Driest Month (Sep) 1.26"

Air Quality

Earthquake History

98 earthquakes (M2.5+) within 150 km since 1990. Strongest: M4.6. Most recent: M3.4 on Jul 19, 2025.

Jun 24, 1997 16 km WNW of Malott, Washington M4.6 126 km
Sep 1, 2015 15 km N of Nespelem Community, Washington M4.2 88 km
Apr 15, 1991 4 km SE of Pateros, Washington M3.9 149 km
Sep 10, 2016 23 km E of Oliver, Canada M3.9 58 km
Mar 3, 1998 16 km NNE of Grand Forks, Canada M3.8 20 km
Jan 26, 1992 9 km SSE of Okanagan Falls, Canada M3.7 80 km
Jun 24, 1997 16 km NW of Malott, Washington M3.6 125 km
Jul 19, 2025 34 km W of Okanagan Falls, Canada M3.4 119 km
Oct 27, 1991 21 km N of Castlegar, Canada M3.3 84 km
Aug 20, 1990 23 km NW of Nelson, Canada M3.3 97 km
Apr 20, 2025 8 km NW of Tonasket, Washington M3.2 80 km
Apr 13, 2025 7 km NW of Tonasket, Washington M3.2 80 km
Feb 15, 2020 37 km ESE of Nelson, Canada M3.2 129 km
Mar 3, 1998 15 km NNE of Grand Forks, Canada M3.2 19 km
May 15, 2025 9 km NW of Tonasket, Washington M3.1 79 km
Apr 13, 2025 6 km NW of Tonasket, Washington M3.1 79 km
Jan 31, 1999 22 km N of Keller, Washington M3.1 83 km
Nov 25, 2000 13 km SSE of Oroville, Washington M3.1 65 km
Apr 16, 2025 9 km NW of Tonasket, Washington M3.1 81 km
Nov 12, 1998 22 km WSW of Nespelem Community, Washington M3.0 116 km
Source: USGS (M2.5+, 1990-2025)

Tsunami History

9 tsunamis recorded within 500 km. Highest wave on record: 19.8 m (65 ft).

Year Location Cause Max Wave Deaths Distance
1952 COLUMBIA RIVER VALLEY, WA Meteorological 19.8 m - 56 km
1949 COLUMBIA RIVER VALLEY, WA Meteorological 19.8 m - 133 km
2024 COLUMBIA RIVER VALLEY, WA Meteorological 14.3 m - 56 km
1944 COLUMBIA RIVER VALLEY, WA Meteorological 9.1 m - 56 km
2009 COLUMBIA RIVER VALLEY, WA Meteorological 9.0 m - 139 km
1953 COLUMBIA RIVER VALLEY, WA Meteorological 4.8 m - 56 km
2009 COLUMBIA RIVER VALLEY, WA Meteorological 3.6 m - 127 km
1953 COLUMBIA RIVER VALLEY, WA Meteorological - - 56 km
1952 COLUMBIA RIVER VALLEY, WA Meteorological - - 56 km
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.

Wildfire History

20 wildfires (100+ acres) within 100 km. Largest: NORTH STAR (218,547 ac, 2015).

Year Name Acres Distance
2015 NORTH STAR 218,547 75 km
2015 TUNK BLOCK 180,111 86 km
2021 SUMMIT TRAIL 54,855 72 km
2015 STICKPIN 54,119 20 km
1985 BARKER MT 32,839 68 km
2021 WALKER CREEK 26,165 50 km
2014 DEVILS ELBOW COMPLEX 25,988 85 km
1988 WHITE MOUNTAIN 21,855 51 km
2020 PALMER 18,015 81 km
1996 TIMBERLINE COMPLEX 17,009 93 km
2023 EAGLE BLUFF 16,499 78 km
2007 TUNK GRADE 15,007 82 km
2015 RENNER 13,975 36 km
2020 KEWA FIELD 11,811 94 km
2000 ROCKY HULL 9,927 66 km
1994 COPPER BUTTE 9,068 32 km
2015 GRAVES MOUNTAIN 8,559 45 km
1994 UNNAMED 8,385 81 km
1988 S.17MILE1 8,089 65 km
2021 BULLDOG MOUNTAIN 8,049 30 km
Source: NIFC/IRWIN (100+ acres)

Monthly Weather

Month Avg Temperature Precipitation Summary
January 22°F (-5°C) 2.2 in Coldest
February 28°F (-2°C) 1.6 in
March 36°F (2°C) 1.6 in
April 44°F (6°C) 1.7 in
May 52°F (11°C) 2.2 in
June 58°F (15°C) 2.4 in
July 64°F (18°C) 1.5 in
August 64°F (18°C) 1.5 in Warmest
September 55°F (13°C) 1.3 in Driest
October 43°F (6°C) 1.4 in
November 32°F (-0°C) 2.3 in
December 23°F (-5°C) 2.6 in Wettest

Sion has a seasonal temperature swing of 42°F / from 22°F in January to 64°F in August. Total annual precipitation is 22.3 inches, with December being the wettest month (2.6") and September the driest (1.3").

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