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Weather & Climate in West Haven-Sylvan, OR

Temperature, precipitation, air quality, natural hazards, and monthly weather data.

West Haven-Sylvan experiences four distinct seasons with an average annual temperature of 55°F (13°C). Winters average 42°F in January while summers reach 69°F in July. The area gets 251 sunny days per year, above the national average. Annual precipitation totals 44.1 inches. The area receives 3.6 inches of snow annually. Air quality is rated Good with a median AQI of 32. The city sits at an elevation of 608 feet.

Temperature

42°F Jan (6°C) 69°F Jul (21°C)
Annual Average54.8°F
1% above US avg
January Average42°F (6°C)
July Average69°F (21°C)
Sunny Days251 days/yr

Geography

Elevation608 ft (185 m)
Area1.0 sq mi (2.7 km²)
Population Density3,690/sq mi
Coordinates45.5164°N, 122.7654°W
TimezoneAmerica/Los_Angeles
CountyMultnomah County County
Nearest AirportPortland International (PDX)
10 miles away

Precipitation & Snow

Annual Rainfall 44.1"
16% above US avg
Snowfall 3.6"
Wettest Month (Dec) 7.17"
Driest Month (Jul) 0.75"

Air Quality

AQI Median32.0
RatingGood

Natural Hazard Risk

Overall RiskRelatively High
Risk Score98.5 / 100
Social Vulnerability29.8 / 100
Community Resilience95.5 / 100

Hazard Breakdown

Tornado Relatively Low
Earthquake Relatively High
Wildfire Relatively Low
Flood Relatively High
Hail Very Low
Strong Wind Relatively Moderate
Heat Wave Relatively High
Winter Weather Relatively High
Lightning Relatively Low
Ice Storm Relatively High
Drought Very Low
Cold Wave Relatively High
Landslide Relatively Moderate
Coastal Flood Relatively Low
Volcano Relatively Moderate
Avalanche Very Low
Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

987 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.6.

Mar 25, 1993 4 km E of Scotts Mills, Oregon M5.6 55 km 20 km
Jun 29, 2002 6 km ENE of Government Camp, Oregon M4.5 87 km 5 km
Feb 14, 2011 31 km S of Morton, Washington M4.3 95 km 4 km
Jul 14, 2008 11 km ESE of Maupin, Oregon M4.2 148 km 16 km
Jun 6, 2021 6 km NE of Government Camp, Oregon M3.9 86 km 4 km
Apr 24, 2003 3 km NW of North Portland, Oregon M3.9 13 km 17 km
Oct 1, 2004 37 km NNE of Amboy, Washington M3.9 88 km -1 km
Jun 25, 2004 17 km W of Packwood, Washington M3.9 141 km -1 km
Jan 3, 2018 37 km SSE of Morton, Washington M3.9 99 km 10 km
Feb 8, 1995 9 km ESE of Hubbard, Oregon M3.8 42 km 24 km
Aug 3, 2006 2 km WNW of Cherry Grove, Washington M3.8 34 km 14 km
Jun 29, 2002 7 km NE of Government Camp, Oregon M3.8 87 km 5 km
Jun 14, 2007 12 km ESE of Maupin, Oregon M3.8 149 km 18 km
Jun 8, 1993 5 km ESE of Scotts Mills, Oregon M3.7 56 km 19 km
Oct 1, 2004 36 km NNE of Amboy, Washington M3.7 87 km -2 km
Aug 23, 2013 24 km SSE of Mossyrock, Washington M3.7 94 km 14 km
Jan 31, 2013 3 km ENE of Amboy, Washington M3.7 53 km 6 km
Oct 1, 2004 37 km NNE of Amboy, Washington M3.6 88 km -1 km
Aug 5, 2006 37 km NNE of Amboy, Washington M3.6 88 km -1 km
Jul 31, 2006 37 km NNE of Amboy, Washington M3.6 88 km -1 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

63 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 6 fatalities, 304 injuries.

Date Rating Distance Path Fatalities
Apr 5, 1972 EF3 14 km 8.7 mi 6
Oct 14, 2016 EF2 94 km 0.7 mi 0
Dec 14, 2010 EF2 76 km 5.0 mi 0
Dec 8, 1993 EF2 30 km 6.0 mi 0
Dec 10, 2015 EF1 33 km 0.8 mi 0
Oct 23, 2014 EF1 70 km 1.3 mi 0
Jun 13, 2013 EF1 47 km 0.3 mi 0
Jan 10, 2008 EF1 19 km 10.1 mi 0
Jun 21, 2003 EF1 81 km 0.3 mi 0
Oct 9, 2000 EF1 42 km 0.1 mi 0
Oct 9, 2000 EF1 27 km 0.1 mi 0
Nov 12, 1991 EF1 15 km 0.2 mi 0
Nov 12, 1991 EF1 30 km 0.2 mi 0
Jun 29, 1989 EF1 41 km 1.6 mi 0
Mar 28, 1985 EF1 75 km 0.2 mi 0
Oct 13, 1984 EF1 45 km 3.0 mi 0
Aug 16, 1978 EF1 31 km 0.2 mi 0
Dec 12, 1975 EF1 85 km 2.0 mi 0
Mar 8, 1960 EF1 84 km 1.0 mi 0
Apr 12, 1957 EF1 42 km 2.5 mi 0
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Tsunami History

1 tsunami recorded within 500 km. Highest wave on record: 250.0 m (820 ft).

Year Location Cause Max Wave Deaths Distance
1980 WASHINGTON Explosion 250.0 m 61 89 km
Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

11 volcanoes within 200 km. Closest: West Crater (67 km).

Name Type Elevation Last Eruption Distance
West Crater Volcanic field 1,329 m (4,360 ft) -5750 67 km
Hood Stratovolcano 3,426 m (11,240 ft) 1866 85 km
Indian Heaven Shield(s) 1,806 m (5,925 ft) -6250 87 km
St. Helens Stratovolcano 2,549 m (8,363 ft) 2008 89 km
Jefferson Stratovolcano 3,199 m (10,495 ft) 950 121 km
Adams Stratovolcano 3,742 m (12,277 ft) 950 125 km
Sand Mountain Field Pyroclastic cone(s) 1,664 m (5,459 ft) -950 142 km
Belknap Shield(s) 2,095 m (6,873 ft) 480 155 km
Rainier Stratovolcano 4,392 m (14,409 ft) 1450 168 km
Three Sisters Complex 3,159 m (10,364 ft) 440 173 km
Bachelor Stratovolcano 2,763 m (9,065 ft) -5800 191 km
Source: Smithsonian Institution Global Volcanism Program (GVP).

Wildfire History

18 wildfires (100+ acres) recorded within 100 km. Largest: BEACHIE CREEK (194,619 acres, 2020).

Year Name Acres Burned Distance
2020 BEACHIE CREEK 194,619 79 km
2020 RIVERSIDE 138,190 60 km
2017 EAGLE CREEK 48,816 65 km
2021 BULL COMPLEX 26,233 92 km
2020 BIG HOLLOW 24,243 72 km
2011 DOLLAR LAKE 6,069 84 km
2014 36 PIT 5,838 57 km
1987 ROCKHOUSE 5,011 88 km
2008 GNARL RIDGE 3,502 90 km
2011 MOTHER LODE 2,881 90 km
2022 SIOUXON 2,551 69 km
2010 BULL OF THE WOODS 2,535 89 km
2023 CAMP CREEK 2,056 54 km
2006 MT. HOOD COMPLEX 1,849 95 km
2022 NAKIA CREEK 1,737 41 km
2020 DOWTY RD 1,424 36 km
1991 FALLS 1,389 48 km
1987 87552212 1,166 93 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 42°F (6°C) 6.6 in
February 43°F (6°C) 5.2 in
March 47°F (8°C) 4.5 in
April 50°F (10°C) 3.1 in
May 56°F (13°C) 2.4 in
June 61°F (16°C) 1.7 in
July 69°F (21°C) 0.8 in Warmest, Driest
August 66°F (19°C) 1.0 in
September 62°F (17°C) 1.9 in
October 53°F (12°C) 3.4 in
November 45°F (7°C) 6.7 in
December 40°F (4°C) 7.2 in Coldest, Wettest

West Haven-Sylvan has a seasonal temperature swing of 29°F / from 40°F in December to 69°F in July. Total annual precipitation is 44.5 inches, with December being the wettest month (7.2") and July the driest (0.8").

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