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Weather & Climate in Zillah, WA

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

Zillah experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 32°F in January while summers reach 75°F in July. The area gets 279 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 7.8 inches (drier than the 38-inch national average). The area receives 20.4 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 28 / among the cleanest air in the country. The city sits at an elevation of 820 feet.

Temperature

32°F Jan (-0°C) 75°F Jul (24°C)
Annual Average52.3°F
3% below US avg
January Average32°F (-0°C)
July Average75°F (24°C)
Sunny Days279 days/yr

Geography

Elevation820 ft (250 m)
Area1.7 sq mi (4.5 km²)
Population Density1,738/sq mi
Coordinates46.4084°N, 120.2727°W
TimezoneAmerica/Los_Angeles
CountyYakima County County
Nearest AirportTri-Cities (PSC)
56 miles away

Precipitation & Snow

Annual Rainfall 7.8"
79% below US avg
Snowfall 20.4"
Wettest Month (Dec) 1.14"
Driest Month (Jul) 0.20"

Air Quality

AQI Median28.0
RatingGood

Natural Hazard Risk

Overall RiskRelatively Moderate
Risk Score94.0 / 100
Social Vulnerability63.9 / 100
Community Resilience13.5 / 100

Hazard Breakdown

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

Earthquake History

1,068 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.3.

Feb 14, 2011 31 km S of Morton, Washington M4.3 150 km 4 km
Feb 18, 2015 15 km ENE of Cle Elum, Washington M4.2 100 km 4 km
Jun 17, 2010 30 km S of White Swan, Washington M4.2 49 km 3 km
Jan 30, 2000 6 km SE of Condon, Oregon M4.1 135 km -1 km
May 20, 1995 15 km NNE of Ashford, Washington M4.1 138 km 12 km
Aug 16, 2004 16 km ENE of Packwood, Washington M4.0 96 km -1 km
Oct 9, 1998 20 km S of White Swan, Washington M4.0 41 km 2 km
Oct 1, 2004 37 km NNE of Amboy, Washington M3.9 149 km -1 km
Mar 22, 1997 10 km ESE of Condon, Oregon M3.9 136 km 0 km
Jun 25, 2004 17 km W of Packwood, Washington M3.9 127 km -1 km
Nov 18, 1997 20 km NW of Bickleton, Washington M3.9 33 km 15 km
Aug 7, 1992 8 km WSW of Irrigon, Oregon M3.9 81 km 0 km
Jan 3, 2018 37 km SSE of Morton, Washington M3.9 138 km 10 km
Mar 29, 2010 10 km NE of Cliffdell, Washington M3.8 84 km 1 km
Jul 13, 1995 13 km ENE of Ashford, Washington M3.7 131 km 7 km
Sep 4, 2011 14 km N of Richland, Washington M3.7 78 km 2 km
Jul 4, 1997 8 km NNE of Waterville, Washington M3.7 147 km 7 km
Jan 1, 1997 14 km NNE of Selah, Washington M3.7 43 km 18 km
Oct 1, 2004 36 km NNE of Amboy, Washington M3.7 150 km -2 km
May 18, 2008 11 km SSW of Benton City, Washington M3.7 62 km 20 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

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

Date Rating Distance Path Fatalities
Apr 30, 1957 EF2 28 km 1.0 mi 0
May 19, 2006 EF1 79 km 0.1 mi 0
Apr 23, 1983 EF1 98 km 3.0 mi 0
May 1, 2024 EF0 75 km 0.4 mi 0
Mar 31, 2020 EF0 77 km 0.1 mi 0
May 22, 2016 EF0 88 km 0.2 mi 0
Aug 13, 2014 EF0 38 km 0.3 mi 0
Apr 7, 2008 EF0 28 km 0.1 mi 0
May 9, 2005 EF0 28 km 0.2 mi 0
Apr 23, 2005 EF0 14 km 0.1 mi 0
Apr 23, 2005 EF0 7 km 0.1 mi 0
Jun 7, 2004 EF0 58 km 0.5 mi 0
May 15, 2000 EF0 5 km 0.2 mi 0
May 9, 1999 EF0 39 km — 0
Aug 26, 1997 EF0 35 km 1.0 mi 0
May 9, 1956 EF0 89 km 10.2 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 61 148 km
Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

7 volcanoes within 200 km. Closest: Adams (96 km).

Name Type Elevation Last Eruption Distance
Adams Stratovolcano 3,742 m (12,277 ft) 950 96 km
Rainier Stratovolcano 4,392 m (14,409 ft) 1450 124 km
Indian Heaven Shield(s) 1,806 m (5,925 ft) -6250 131 km
St. Helens Stratovolcano 2,549 m (8,363 ft) 2008 148 km
West Crater Volcanic field 1,329 m (4,360 ft) -5750 151 km
Hood Stratovolcano 3,426 m (11,240 ft) 1866 159 km
Glacier Peak Stratovolcano 3,213 m (10,541 ft) 1700 200 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 32 km
2000 24 COMMAND 162,300 53 km
1984 HANFORD 122,914 54 km
2021 SCHNEIDER SPRINGS 114,743 79 km
2000 MULE DRY 90,184 51 km
2013 COLOCKUM TARPS 79,279 86 km
2007 WAUTOMA 77,956 45 km
2020 EVANS CANYON 76,288 55 km
1996 COLD CREEK 72,859 35 km
2018 BOYLSTON 66,292 51 km
2012 TABLE MOUNTAIN COMPLEX 65,887 100 km
2023 NEWELL ROAD 61,833 62 km
2015 COUGAR CREEK 51,866 89 km
2024 BIG HORN 51,023 62 km
2009 DRY CREEK COMPLEX 49,843 26 km
2008 COAL PLANT 45,801 91 km
2024 RETREAT 44,681 61 km
2019 COLD CREEK 43,756 48 km
2015 HIGHWAY 8 35,296 68 km
2003 UMTANUM RIDGE 34,351 35 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 32°F (-0°C) 1.0 in
February 37°F (3°C) 0.7 in
March 45°F (7°C) 0.6 in
April 51°F (11°C) 0.5 in
May 59°F (15°C) 0.5 in
June 66°F (19°C) 0.4 in
July 75°F (24°C) 0.2 in Warmest, Driest
August 71°F (22°C) 0.4 in
September 62°F (17°C) 0.4 in
October 52°F (11°C) 0.5 in
November 40°F (4°C) 1.0 in
December 31°F (-0°C) 1.1 in Coldest, Wettest

Zillah has a seasonal temperature swing of 44°F / from 31°F in December to 75°F in July. Total annual precipitation is 7.3 inches, with December being the wettest month (1.1") and July the driest (0.2").

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