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Weather & Climate in Pasco, WA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Pasco enjoys a temperate climate with an average annual temperature of 57°F (14°C). Winters average 35°F in January while summers reach 83°F in July. The area gets 273 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 10.5 inches (drier than the 38-inch national average). The area receives 6.2 inches of snow annually. 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 394 feet.
Temperature
35°F Jan (2°C)
83°F Jul (28°C)
| Annual Average | 56.5°F |
| 5% above US avg | |
| January Average | 35°F (2°C) |
| July Average | 83°F (28°C) |
| Sunny Days | 273 days/yr |
Geography
| Elevation | 394 ft (120 m) |
| Area | 34.1 sq mi (88.2 km²) |
| Population Density | 2,014/sq mi |
| Coordinates | 46.2661°N, 119.1214°W |
| Timezone | America/Los_Angeles |
| County | Benton County County |
| Nearest Airport | Tri-Cities (PSC) 0 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 28.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 87.1 / 100 |
| Social Vulnerability | 30.3 / 100 |
| Community Resilience | 58.6 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Relatively Moderate |
| Flood | Relatively Moderate |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively High |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively High |
| Drought | Very Low |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Low |
| Volcano | Very Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
208 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 | 69 km | 9 km |
| Jun 17, 2010 | 30 km S of White Swan, Washington | M4.2 | 126 km | 3 km |
| Jan 30, 2000 | 6 km SE of Condon, Oregon | M4.1 | 142 km | -1 km |
| Jul 14, 1992 | 6 km S of Walla Walla East, Washington | M4.1 | 70 km | 11 km |
| Oct 9, 1998 | 20 km S of White Swan, Washington | M4.0 | 122 km | 2 km |
| Mar 22, 1997 | 10 km ESE of Condon, Oregon | M3.9 | 140 km | 0 km |
| Nov 18, 1997 | 20 km NW of Bickleton, Washington | M3.9 | 105 km | 15 km |
| Aug 7, 1992 | 8 km WSW of Irrigon, Oregon | M3.9 | 58 km | 0 km |
| Sep 4, 2011 | 14 km N of Richland, Washington | M3.7 | 19 km | 2 km |
| Jan 1, 1997 | 14 km NNE of Selah, Washington | M3.7 | 117 km | 18 km |
| May 18, 2008 | 11 km SSW of Benton City, Washington | M3.7 | 35 km | 20 km |
| Feb 1, 2000 | 7 km SE of Condon, Oregon | M3.6 | 142 km | -1 km |
| Jan 23, 2015 | 3 km N of Cayuse, Oregon | M3.5 | 76 km | 20 km |
| Aug 31, 1999 | Washington-Oregon border region | M3.5 | 142 km | 3 km |
| Jun 29, 2005 | 0 km SE of Gleed, Washington | M3.5 | 122 km | 9 km |
| Oct 26, 1992 | 12 km N of Naches, Washington | M3.5 | 137 km | -1 km |
| Oct 12, 2017 | 25 km NW of Bickleton, Washington | M3.4 | 110 km | 13 km |
| Jan 30, 2000 | 8 km SE of Condon, Oregon | M3.4 | 143 km | -1 km |
| Nov 6, 1997 | 22 km SE of Desert Aire, Washington | M3.4 | 54 km | 22 km |
| Oct 15, 2011 | 13 km N of Richland, Washington | M3.4 | 19 km | 1 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
28 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2.
| Date | Rating | Distance | Path | Fatalities |
| Jun 26, 1958 | EF2 | 26 km | 0.3 mi | 0 |
| May 6, 2022 | EF1 | 84 km | 2.9 mi | 0 |
| May 6, 2009 | EF1 | 77 km | 1.6 mi | 0 |
| May 19, 2006 | EF1 | 65 km | 0.1 mi | 0 |
| Jan 16, 2000 | EF1 | 86 km | 1.0 mi | 0 |
| Aug 10, 1985 | EF1 | 80 km | 1.0 mi | 0 |
| Apr 23, 1983 | EF1 | 31 km | 3.0 mi | 0 |
| Jul 1, 1978 | EF1 | 57 km | 2.3 mi | 0 |
| Mar 5, 2024 | EF0 | 70 km | 0.2 mi | 0 |
| Jun 27, 2023 | EF0 | 72 km | 0.1 mi | 0 |
| Mar 31, 2020 | EF0 | 14 km | 0.1 mi | 0 |
| May 22, 2016 | EF0 | 8 km | 0.2 mi | 0 |
| Aug 13, 2014 | EF0 | 53 km | 0.3 mi | 0 |
| Apr 23, 2005 | EF0 | 93 km | 0.1 mi | 0 |
| Apr 23, 2005 | EF0 | 91 km | 0.1 mi | 0 |
| Jun 7, 2004 | EF0 | 55 km | 0.5 mi | 0 |
| May 23, 2004 | EF0 | 59 km | 0.1 mi | 0 |
| May 11, 2003 | EF0 | 85 km | 0.1 mi | 0 |
| Jul 13, 2002 | EF0 | 67 km | 0.2 mi | 0 |
| May 15, 2000 | EF0 | 89 km | 0.2 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Nearby Volcanoes
1 volcano within 200 km. Closest: Adams (182 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Adams | Stratovolcano | 3,742 m (12,277 ft) | 950 | 182 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 | 63 km |
| 2000 | 24 COMMAND | 162,300 | 40 km |
| 1984 | HANFORD | 122,914 | 39 km |
| 2000 | MULE DRY | 90,184 | 83 km |
| 2007 | WAUTOMA | 77,956 | 50 km |
| 1996 | COLD CREEK | 72,859 | 85 km |
| 2018 | BOYLSTON | 66,292 | 100 km |
| 2024 | BIG HORN | 51,023 | 87 km |
| 2009 | DRY CREEK COMPLEX | 49,843 | 68 km |
| 2008 | COAL PLANT | 45,801 | 79 km |
| 2019 | COLD CREEK | 43,756 | 47 km |
| 2015 | HIGHWAY 8 | 35,296 | 97 km |
| 2003 | UMTANUM RIDGE | 34,351 | 86 km |
| 2017 | SILVER DOLLAR | 30,789 | 61 km |
| 2007 | HORSE HEAVEN COMPLEX (SIX PRONG) | 28,225 | 89 km |
| 2000 | UNNAMED | 27,815 | 88 km |
| 2015 | UNNAMED | 27,736 | 82 km |
| 2017 | 400 | 27,218 | 81 km |
| 2020 | TAYLOR POND | 22,591 | 89 km |
| 2018 | L RD SW | 22,101 | 62 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 35°F (2°C) | 1.1 in | |
| February | 39°F (4°C) | 0.8 in | |
| March | 47°F (8°C) | 0.8 in | |
| April | 53°F (12°C) | 0.6 in | |
| May | 61°F (16°C) | 0.7 in | |
| June | 68°F (20°C) | 0.4 in | |
| July | 83°F (28°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) | 0.6 in | |
| November | 42°F (6°C) | 1.1 in | |
| December | 34°F (1°C) | 1.1 in | Coldest, Wettest |
Pasco has a seasonal temperature swing of 49°F / from 34°F in December to 83°F in July. Total annual precipitation is 8.1 inches, with December being the wettest month (1.1") and July the driest (0.2").