Weather & Climate in Mission, OR

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

Mission experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 35°F in January while summers reach 73°F in July. Annual precipitation totals 12.8 inches (drier than the 38-inch national average). The area receives 15.7 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 38. 74% of days have good air quality. The city sits at an elevation of 1,423 feet.

Temperature

35°F Jan (2°C) 73°F Jul (23°C)
Annual Average52.1°F
4% below US avg
January Average35°F (2°C)
July Average73°F (23°C)

Geography

Elevation1,423 ft (434 m)
Area7.6 sq mi (19.7 km²)
Population Density123/sq mi
Coordinates45.6586°N, 118.6655°W
TimezoneAmerica/Los_Angeles
CountyUmatilla County County
Nearest AirportEastern Oregon Regional At Pendleton (PDT)
7 miles away

Precipitation & Snow

Annual Rainfall 12.8"
66% below US avg
Snowfall 15.7"
Wettest Month (Jan) 1.52"
Driest Month (Jul) 0.26"

Air Quality

AQI Median38.0
RatingGood
Good Days %74.3%
Unhealthy Days4

Natural Hazard Risk

Overall RiskRelatively Moderate
Risk Score82.3 / 100
Social Vulnerability59.6 / 100
Community Resilience15.9 / 100

Hazard Breakdown

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

Earthquake History

160 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.3.

Nov 28, 1991 7 km S of Walla Walla East, Washington M4.3 46 km 9 km
Jan 30, 2000 6 km SE of Condon, Oregon M4.1 125 km -1 km
Jul 14, 1992 6 km S of Walla Walla East, Washington M4.1 46 km 11 km
Nov 18, 1997 20 km NW of Bickleton, Washington M3.9 150 km 15 km
Aug 7, 1992 8 km WSW of Irrigon, Oregon M3.9 75 km 0 km
Mar 22, 1997 10 km ESE of Condon, Oregon M3.9 121 km 0 km
Sep 4, 2011 14 km N of Richland, Washington M3.7 95 km 2 km
May 18, 2008 11 km SSW of Benton City, Washington M3.7 89 km 20 km
Feb 1, 2000 7 km SE of Condon, Oregon M3.6 124 km -1 km
Jan 23, 2015 3 km N of Cayuse, Oregon M3.5 11 km 20 km
Aug 31, 1999 Washington-Oregon border region M3.5 123 km 3 km
Jan 13, 1994 11 km SW of Lind, Washington M3.4 137 km 0 km
Nov 6, 1997 22 km SE of Desert Aire, Washington M3.4 126 km 22 km
Oct 15, 2011 13 km N of Richland, Washington M3.4 95 km 1 km
Jan 30, 2000 8 km SE of Condon, Oregon M3.4 124 km -1 km
Jun 17, 2004 11 km SSE of Washtucna, Washington M3.4 117 km 17 km
Jun 12, 1995 13 km N of Richland, Washington M3.3 95 km 1 km
Dec 15, 1991 6 km SSW of Walla Walla East, Washington M3.3 46 km 8 km
May 1, 2011 13 km N of Richland, Washington M3.3 95 km 2 km
Feb 28, 2004 10 km WSW of Wallula, Washington M3.3 50 km 1 km
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.

Tornado History

22 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2.

Date Rating Distance Path Fatalities
Jun 26, 1958 EF2 50 km 0.3 mi 0
May 6, 2022 EF1 33 km 2.9 mi 0
May 6, 2009 EF1 14 km 1.6 mi 0
May 19, 2006 EF1 81 km 0.1 mi 0
Jul 19, 2004 EF1 96 km 2.2 mi 0
Jan 16, 2000 EF1 90 km 1.0 mi 0
Mar 5, 2024 EF0 30 km 0.2 mi 0
Jun 27, 2023 EF0 46 km 0.1 mi 0
Mar 31, 2020 EF0 89 km 0.1 mi 0
May 22, 2016 EF0 72 km 0.2 mi 0
Apr 14, 2011 EF0 86 km 0.2 mi 0
May 6, 2009 EF0 88 km 0.2 mi 0
Jun 7, 2004 EF0 94 km 0.5 mi 0
May 23, 2004 EF0 48 km 0.1 mi 0
Jul 13, 2002 EF0 14 km 0.2 mi 0
Jul 9, 1995 EF0 49 km 0.1 mi 0
May 1, 1991 EF0 14 km 0.1 mi 0
Aug 24, 1987 EF0 53 km 0.2 mi 0
Jun 21, 1983 EF0 58 km 0.1 mi 0
May 22, 1964 EF0 27 km 10.7 mi 0
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: BATTLE MOUNTAIN COMPLEX (184,979 acres, 2024).

Year Name Acres Burned Distance
2024 BATTLE MOUNTAIN COMPLEX 184,979 87 km
2006 COLUMBIA COMPLEX 118,865 87 km
2015 BUTTE CREEK 79,418 90 km
2007 MONUMENT COMPLEX (RED HILL FIRE) 54,572 97 km
1996 TOWER 50,827 69 km
2008 COAL PLANT 45,801 81 km
2021 GREEN RIDGE 44,604 97 km
2001 MONUMENT COMPLEX (MALLORY) 29,095 97 km
2000 UNNAMED 27,815 50 km
2015 UNNAMED 27,736 86 km
2021 ELBOW CREEK 23,103 86 km
2022 STURGILL 21,641 96 km
1996 UNNAMED 21,130 42 km
2005 WALKER CANYON 20,764 90 km
2010 EUREKA 19,811 88 km
2024 JACK CANYON MUTUAL AID 18,287 35 km
2023 HAT ROCK 17,264 43 km
1990 LOCUSTGROV 17,187 61 km
2020 KAHLOTUS 16,738 98 km
2009 NORTH FORK COMPLEX 16,461 82 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 35°F (2°C) 1.5 in Wettest
February 38°F (3°C) 1.2 in
March 44°F (7°C) 1.3 in
April 50°F (10°C) 1.2 in
May 58°F (14°C) 1.5 in
June 65°F (18°C) 1.1 in
July 73°F (23°C) 0.3 in Warmest, Driest
August 72°F (22°C) 0.3 in
September 64°F (18°C) 0.5 in
October 52°F (11°C) 1.1 in
November 41°F (5°C) 1.4 in
December 34°F (1°C) 1.5 in Coldest

Mission has a seasonal temperature swing of 39°F / from 34°F in December to 73°F in July. Total annual precipitation is 12.8 inches, with January being the wettest month (1.5") and July the driest (0.3").

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