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Weather & Climate in Cedar Mill, OR
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Cedar Mill 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 523 feet.
Temperature
42°F Jan (6°C)
69°F Jul (21°C)
| Annual Average | 54.8°F |
| 1% above US avg | |
| January Average | 42°F (6°C) |
| July Average | 69°F (21°C) |
| Sunny Days | 251 days/yr |
Geography
| Elevation | 523 ft (159 m) |
| Area | 3.3 sq mi (8.6 km²) |
| Population Density | 5,850/sq mi |
| Coordinates | 45.5355°N, 122.8006°W |
| Timezone | America/Los_Angeles |
| County | Multnomah County County |
| Nearest Airport | Portland International (PDX) 11 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 32.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 98.5 / 100 |
| Social Vulnerability | 29.8 / 100 |
| Community Resilience | 95.5 / 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
954 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 | 58 km | 20 km |
| Jun 29, 2002 | 6 km ENE of Government Camp, Oregon | M4.5 | 90 km | 5 km |
| Feb 14, 2011 | 31 km S of Morton, Washington | M4.3 | 95 km | 4 km |
| Jun 6, 2021 | 6 km NE of Government Camp, Oregon | M3.9 | 89 km | 4 km |
| Apr 24, 2003 | 3 km NW of North Portland, Oregon | M3.9 | 12 km | 17 km |
| Oct 1, 2004 | 37 km NNE of Amboy, Washington | M3.9 | 87 km | -1 km |
| Jun 25, 2004 | 17 km W of Packwood, Washington | M3.9 | 140 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 | 45 km | 24 km |
| Aug 3, 2006 | 2 km WNW of Cherry Grove, Washington | M3.8 | 33 km | 14 km |
| Jun 29, 2002 | 7 km NE of Government Camp, Oregon | M3.8 | 90 km | 5 km |
| Jun 8, 1993 | 5 km ESE of Scotts Mills, Oregon | M3.7 | 58 km | 19 km |
| Aug 23, 2013 | 24 km SSE of Mossyrock, Washington | M3.7 | 93 km | 14 km |
| Oct 1, 2004 | 36 km NNE of Amboy, Washington | M3.7 | 87 km | -2 km |
| Jan 31, 2013 | 3 km ENE of Amboy, Washington | M3.7 | 52 km | 6 km |
| Sep 30, 2004 | 37 km NNE of Amboy, Washington | M3.6 | 88 km | -1 km |
| Jul 25, 2006 | 37 km NNE of Amboy, Washington | M3.6 | 87 km | -1 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 | 87 km | -1 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
64 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 | 15 km | 8.7 mi | 6 |
| Oct 14, 2016 | EF2 | 91 km | 0.7 mi | 0 |
| Dec 14, 2010 | EF2 | 78 km | 5.0 mi | 0 |
| Dec 8, 1993 | EF2 | 31 km | 6.0 mi | 0 |
| Dec 10, 2015 | EF1 | 33 km | 0.8 mi | 0 |
| Oct 23, 2014 | EF1 | 67 km | 1.3 mi | 0 |
| Jun 13, 2013 | EF1 | 47 km | 0.3 mi | 0 |
| Jan 10, 2008 | EF1 | 18 km | 10.1 mi | 0 |
| Jun 21, 2003 | EF1 | 82 km | 0.3 mi | 0 |
| Oct 9, 2000 | EF1 | 30 km | 0.1 mi | 0 |
| Oct 9, 2000 | EF1 | 45 km | 0.1 mi | 0 |
| Nov 12, 1991 | EF1 | 17 km | 0.2 mi | 0 |
| Nov 12, 1991 | EF1 | 33 km | 0.2 mi | 0 |
| Jun 29, 1989 | EF1 | 40 km | 1.6 mi | 0 |
| Mar 28, 1985 | EF1 | 72 km | 0.2 mi | 0 |
| Oct 13, 1984 | EF1 | 43 km | 3.0 mi | 0 |
| Aug 16, 1978 | EF1 | 28 km | 0.2 mi | 0 |
| Dec 12, 1975 | EF1 | 82 km | 2.0 mi | 0 |
| Mar 8, 1960 | EF1 | 85 km | 1.0 mi | 0 |
| Apr 12, 1957 | EF1 | 45 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 | 88 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
11 volcanoes within 200 km. Closest: West Crater (68 km).
| Name | Type | Elevation | Last Eruption | Distance |
| West Crater | Volcanic field | 1,329 m (4,360 ft) | -5750 | 68 km |
| Indian Heaven | Shield(s) | 1,806 m (5,925 ft) | -6250 | 88 km |
| Hood | Stratovolcano | 3,426 m (11,240 ft) | 1866 | 88 km |
| St. Helens | Stratovolcano | 2,549 m (8,363 ft) | 2008 | 88 km |
| Jefferson | Stratovolcano | 3,199 m (10,495 ft) | 950 | 124 km |
| Adams | Stratovolcano | 3,742 m (12,277 ft) | 950 | 126 km |
| Sand Mountain Field | Pyroclastic cone(s) | 1,664 m (5,459 ft) | -950 | 146 km |
| Belknap | Shield(s) | 2,095 m (6,873 ft) | 480 | 158 km |
| Rainier | Stratovolcano | 4,392 m (14,409 ft) | 1450 | 167 km |
| Three Sisters | Complex | 3,159 m (10,364 ft) | 440 | 176 km |
| Bachelor | Stratovolcano | 2,763 m (9,065 ft) | -5800 | 194 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 | 82 km |
| 2020 | RIVERSIDE | 138,190 | 64 km |
| 2017 | EAGLE CREEK | 48,816 | 68 km |
| 2021 | BULL COMPLEX | 26,233 | 96 km |
| 2020 | BIG HOLLOW | 24,243 | 72 km |
| 2011 | DOLLAR LAKE | 6,069 | 87 km |
| 2014 | 36 PIT | 5,838 | 60 km |
| 1987 | ROCKHOUSE | 5,011 | 88 km |
| 2008 | GNARL RIDGE | 3,502 | 93 km |
| 2011 | MOTHER LODE | 2,881 | 93 km |
| 2022 | SIOUXON | 2,551 | 70 km |
| 2010 | BULL OF THE WOODS | 2,535 | 92 km |
| 2023 | CAMP CREEK | 2,056 | 57 km |
| 2006 | MT. HOOD COMPLEX | 1,849 | 98 km |
| 2022 | NAKIA CREEK | 1,737 | 43 km |
| 2020 | DOWTY RD | 1,424 | 39 km |
| 1991 | FALLS | 1,389 | 50 km |
| 1987 | 87552212 | 1,166 | 94 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 |
Cedar Mill 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").