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Weather & Climate in Umatilla, OR

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

Umatilla experiences four distinct seasons with an average annual temperature of 54°F (12°C). Winters average 36°F in January while summers reach 75°F in July. The area gets 293 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 7.9 inches (drier than the 38-inch national average). 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 332 feet.

Temperature

36°F Jan (2°C) 75°F Jul (24°C)
Annual Average53.9°F
0% below US avg
January Average36°F (2°C)
July Average75°F (24°C)
Sunny Days293 days/yr

Geography

Elevation332 ft (101 m)
Area4.6 sq mi (12.0 km²)
Population Density1,485/sq mi
Coordinates45.9176°N, 119.3320°W
TimezoneAmerica/Los_Angeles
CountyMorrow County County
Nearest AirportTri-Cities (PSC)
26 miles away

Precipitation & Snow

Annual Rainfall 7.9"
79% below US avg
Wettest Month (Nov) 1.26"
Driest Month (Jul) 0.24"

Air Quality

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

Natural Hazard Risk

Overall RiskVery Low
Risk Score26.4 / 100
Social Vulnerability26.6 / 100
Community Resilience2.8 / 100

Hazard Breakdown

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

Earthquake History

202 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 79 km 9 km
Jun 17, 2010 30 km S of White Swan, Washington M4.2 111 km 3 km
Jan 30, 2000 6 km SE of Condon, Oregon M4.1 101 km -1 km
Jul 14, 1992 6 km S of Walla Walla East, Washington M4.1 80 km 11 km
Oct 9, 1998 20 km S of White Swan, Washington M4.0 111 km 2 km
Aug 7, 1992 8 km WSW of Irrigon, Oregon M3.9 21 km 0 km
Nov 18, 1997 20 km NW of Bickleton, Washington M3.9 91 km 15 km
Mar 22, 1997 10 km ESE of Condon, Oregon M3.9 98 km 0 km
Jan 1, 1997 14 km NNE of Selah, Washington M3.7 129 km 18 km
May 18, 2008 11 km SSW of Benton City, Washington M3.7 33 km 20 km
Sep 4, 2011 14 km N of Richland, Washington M3.7 55 km 2 km
Feb 1, 2000 7 km SE of Condon, Oregon M3.6 101 km -1 km
Jan 23, 2015 3 km N of Cayuse, Oregon M3.5 65 km 20 km
Jun 29, 2005 0 km SE of Gleed, Washington M3.5 128 km 9 km
Oct 26, 1992 12 km N of Naches, Washington M3.5 147 km -1 km
Aug 31, 1999 Washington-Oregon border region M3.5 101 km 3 km
Oct 12, 2017 25 km NW of Bickleton, Washington M3.4 97 km 13 km
Oct 15, 2011 13 km N of Richland, Washington M3.4 55 km 1 km
Jan 30, 2000 8 km SE of Condon, Oregon M3.4 101 km -1 km
Jun 17, 2004 11 km SSE of Washtucna, Washington M3.4 119 km 17 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

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

Date Rating Distance Path Fatalities
Jun 26, 1958 EF2 35 km 0.3 mi 0
May 6, 2022 EF1 83 km 2.9 mi 0
May 6, 2009 EF1 67 km 1.6 mi 0
May 19, 2006 EF1 29 km 0.1 mi 0
Apr 23, 1983 EF1 73 km 3.0 mi 0
Jul 1, 1978 EF1 99 km 2.3 mi 0
Mar 5, 2024 EF0 71 km 0.2 mi 0
Jun 27, 2023 EF0 82 km 0.1 mi 0
Mar 31, 2020 EF0 46 km 0.1 mi 0
May 22, 2016 EF0 34 km 0.2 mi 0
Aug 13, 2014 EF0 58 km 0.3 mi 0
Apr 14, 2011 EF0 63 km 0.2 mi 0
Apr 23, 2005 EF0 90 km 0.1 mi 0
Apr 23, 2005 EF0 85 km 0.1 mi 0
Jun 7, 2004 EF0 35 km 0.5 mi 0
May 23, 2004 EF0 19 km 0.1 mi 0
Jul 13, 2002 EF0 46 km 0.2 mi 0
May 15, 2000 EF0 92 km 0.2 mi 0
Jul 9, 1995 EF0 13 km 0.1 mi 0
May 1, 1991 EF0 57 km 0.1 mi 0
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Nearby Volcanoes

3 volcanoes within 200 km. Closest: Adams (170 km).

Name Type Elevation Last Eruption Distance
Adams Stratovolcano 3,742 m (12,277 ft) 950 170 km
Indian Heaven Shield(s) 1,806 m (5,925 ft) -6250 192 km
Hood Stratovolcano 3,426 m (11,240 ft) 1866 193 km
Source: Smithsonian Institution Global Volcanism Program (GVP).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: RANGE 12 (167,604 acres, 2016).

Year Name Acres Burned Distance
2016 RANGE 12 167,604 76 km
2000 24 COMMAND 162,300 61 km
1984 HANFORD 122,914 60 km
2000 MULE DRY 90,184 61 km
2007 WAUTOMA 77,956 69 km
2023 NEWELL ROAD 61,833 78 km
2024 BIG HORN 51,023 59 km
2009 DRY CREEK COMPLEX 49,843 78 km
2008 COAL PLANT 45,801 39 km
2019 COLD CREEK 43,756 67 km
2015 HIGHWAY 8 35,296 67 km
2016 0353 RN SCOTT CANYON 32,051 91 km
2017 SILVER DOLLAR 30,789 80 km
2007 HORSE HEAVEN COMPLEX (SIX PRONG) 28,225 62 km
2000 UNNAMED 27,815 50 km
2015 UNNAMED 27,736 43 km
2017 400 27,218 99 km
2013 MILE MARKER 28 25,605 99 km
2018 L RD SW 22,101 89 km
1996 UNNAMED 21,130 41 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 36°F (2°C) 1.2 in
February 39°F (4°C) 0.9 in
March 46°F (8°C) 0.9 in
April 53°F (11°C) 0.7 in
May 60°F (16°C) 0.8 in
June 67°F (19°C) 0.5 in
July 75°F (24°C) 0.2 in Warmest, Driest
August 73°F (23°C) 0.4 in
September 64°F (18°C) 0.4 in
October 53°F (12°C) 0.7 in
November 42°F (6°C) 1.3 in Wettest
December 35°F (1°C) 1.2 in Coldest

Umatilla has a seasonal temperature swing of 40°F / from 35°F in December to 75°F in July. Total annual precipitation is 9.1 inches, with November being the wettest month (1.3") and July the driest (0.2").

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