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Union Gap, WA
Full City Profile · Washington · Yakima County County
2.6
/5.0
C+
Fair
6,511
Population
1,167/sq mi density
$58,958
Median Income
$23,585 per capita
$186,200
Home Value
$250,297 Zillow
$1,111
Median Rent
27.7% income on rent
49°F
Avg Temperature
279 sunny days/yr
243
Violent Crime/100K
9,413 property/100K
C+
Overall
2.6 / 5.0
Fair overall score based on economy, affordability, safety and education
B
Economy
3.1 / 5.0
$58,958 median income, 7.6% unemployment
A+
Affordability
4.9 / 5.0
$186,200 home value, $1,111/mo rent
F
Safety
1.0 / 5.0
243 violent crimes/100K
F
Education
1.3 / 5.0
4.3% bachelor's degree or higher
Union Gap experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 30°F in January while summers reach 71°F in July. The area gets 279 sunny days per year. Annual precipitation totals 8.4 inches. Air quality is rated Good with a median AQI of 28.
Temperature
30°F Jan (-1°C)
71°F Jul (22°C)
| Annual Average | 49.2°F |
| 9% below US avg | |
| January Average | 30°F (-1°C) |
| July Average | 71°F (22°C) |
| Sunny Days | 279 days/yr |
Geography
| Elevation | 989 ft (301 m) |
| Area | 2.2 sq mi (5.6 km²) |
| Population Density | 1,167/sq mi |
| Coordinates | 46.5544°N, 120.4921°W |
| Timezone | America/Los_Angeles |
| County | Yakima County County |
| Nearest Airport | Tri-Cities (PSC) 68 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 28.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| PM2.5 (Fine Particles) | 9.1 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 94.0 / 100 |
| Social Vulnerability | 63.9 / 100 |
| Community Resilience | 13.5 / 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)
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 | 135 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
7 volcanoes within 200 km. Closest: Adams (86 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Adams | Stratovolcano | 3,742 m (12,277 ft) | 950 | 86 km |
| Rainier | Stratovolcano | 4,392 m (14,409 ft) | 1450 | 102 km |
| Indian Heaven | Shield(s) | 1,806 m (5,925 ft) | -6250 | 124 km |
| St. Helens | Stratovolcano | 2,549 m (8,363 ft) | 2008 | 135 km |
| West Crater | Volcanic field | 1,329 m (4,360 ft) | -5750 | 143 km |
| Hood | Stratovolcano | 3,426 m (11,240 ft) | 1866 | 161 km |
| Glacier Peak | Stratovolcano | 3,213 m (10,541 ft) | 1700 | 179 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 30°F (-1°C) | 1.2 in | Coldest |
| February | 36°F (2°C) | 0.8 in | |
| March | 43°F (6°C) | 0.7 in | |
| April | 50°F (10°C) | 0.6 in | |
| May | 58°F (14°C) | 0.5 in | |
| June | 65°F (18°C) | 0.5 in | |
| July | 71°F (22°C) | 0.2 in | Warmest, Driest |
| August | 71°F (22°C) | 0.4 in | |
| September | 62°F (17°C) | 0.4 in | |
| October | 51°F (10°C) | 0.5 in | |
| November | 39°F (4°C) | 1.1 in | |
| December | 30°F (-1°C) | 1.4 in | Wettest |
Union Gap has a seasonal temperature swing of 41°F / from 30°F in January to 71°F in July. Total annual precipitation is 8.2 inches, with December being the wettest month (1.4") and July the driest (0.2").