Weather & Climate in West Mountain, UT
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
West Mountain experiences four distinct seasons with an average annual temperature of 51°F (10°C). Winters average 29°F in January while summers reach 76°F in July. Annual precipitation totals 18.4 inches (drier than the 38-inch national average). The area receives 55.1 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 47. 57% of days have good air quality. The city sits at an elevation of 4,561 feet.
Temperature
29°F Jan (-2°C)
76°F Jul (25°C)
| Annual Average | 50.7°F |
| 6% below US avg | |
| January Average | 29°F (-2°C) |
| July Average | 76°F (25°C) |
Geography
| Elevation | 4,561 ft (1,390 m) |
| Area | 9.5 sq mi (24.7 km²) |
| Population Density | 130/sq mi |
| Coordinates | 40.0518°N, 111.7834°W |
| Timezone | America/Denver |
| County | Utah County County |
| Nearest Airport | Salt Lake City International (SLC) 52 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 47.0 |
| Rating | Good |
| Good Days % | 57.4% |
| Unhealthy Days | 9 |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 95.3 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 83.2 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Earthquake | Relatively High |
| Wildfire | Relatively High |
| Flood | Relatively Moderate |
| Hail | Very Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively High |
| Lightning | Very High |
| Ice Storm | Relatively Low |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Low |
| Landslide | Relatively Low |
| Volcano | Very Low |
| Avalanche | Relatively High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
663 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.7.
| Mar 18, 2020 | 5 km NNE of Magna, Utah | M5.7 | 82 km | 12 km |
| Mar 18, 2020 | 6 km NNE of Magna, Utah | M4.6 | 82 km | 9 km |
| Mar 18, 2020 | 5 km NE of Magna, Utah | M4.6 | 81 km | 11 km |
| Jun 24, 1992 | 30 km WSW of Emery, Utah | M4.3 | 142 km | 5 km |
| Apr 17, 2003 | 6 km SSW of Levan, Utah | M4.2 | 61 km | 1 km |
| Apr 16, 2020 | 4 km NE of Magna, Utah | M4.2 | 80 km | 10 km |
| Apr 15, 2020 | 4 km NE of Magna, Utah | M4.2 | 79 km | 9 km |
| Mar 16, 1992 | 6 km S of Herriman, Utah | M4.2 | 50 km | 12 km |
| Jul 19, 2001 | 31 km NNE of Fremont, Utah | M4.2 | 148 km | 7 km |
| Mar 18, 2020 | 1 km NNW of Magna, Utah | M4.2 | 79 km | 9 km |
| Mar 7, 2000 | 7 km N of Helper, Utah | M4.2 | 87 km | -3 km |
| Jun 29, 2014 | 6 km SE of Spring City, Utah | M4.2 | 74 km | 9 km |
| May 25, 2016 | 15 km NNE of Tabiona, Utah | M4.0 | 108 km | 16 km |
| Mar 18, 2020 | 4 km NNE of Magna, Utah | M4.0 | 81 km | 7 km |
| May 1, 2025 | 4 km WNW of Independence, Utah | M3.9 | 50 km | 14 km |
| Jan 6, 1996 | 15 km SE of Castle Dale, Utah | M3.9 | 129 km | 6 km |
| Mar 23, 2020 | 8 km NNE of Magna, Utah | M3.9 | 84 km | 10 km |
| Mar 18, 2020 | 4 km NNE of Magna, Utah | M3.9 | 81 km | 9 km |
| Mar 18, 2020 | 6 km NE of Magna, Utah | M3.9 | 82 km | 10 km |
| Oct 11, 1999 | 2 km W of Glenwood, Utah | M3.8 | 144 km | 9 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
40 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 1 fatality, 82 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 19, 2022 | EF2 | 91 km | 2.1 mi | 0 |
| Sep 8, 2002 | EF2 | 88 km | 2.7 mi | 0 |
| Aug 11, 1999 | EF2 | 76 km | 4.3 mi | 1 |
| Feb 9, 1965 | EF2 | 79 km | 0.1 mi | 0 |
| Jun 3, 1963 | EF2 | 93 km | 2.0 mi | 0 |
| Jun 16, 1955 | EF2 | 92 km | 2.7 mi | 0 |
| Sep 2, 2021 | EF1 | 90 km | 2.1 mi | 0 |
| Jun 2, 1993 | EF1 | 87 km | 1.0 mi | 0 |
| May 3, 1993 | EF1 | 77 km | 0.1 mi | 0 |
| Jul 25, 1991 | EF1 | 71 km | 10.0 mi | 0 |
| Jul 8, 1989 | EF1 | 62 km | 0.2 mi | 0 |
| Mar 2, 1989 | EF1 | 77 km | 0.2 mi | 0 |
| Jan 10, 1989 | EF1 | 59 km | 0.2 mi | 0 |
| Dec 2, 1970 | EF1 | 42 km | 1.0 mi | 0 |
| Aug 14, 1968 | EF1 | 80 km | 0.1 mi | 0 |
| Apr 17, 1966 | EF1 | 21 km | 0.1 mi | 0 |
| Jul 9, 1965 | EF1 | 40 km | 0.4 mi | 0 |
| May 28, 2018 | EF0 | 56 km | 0.3 mi | 0 |
| Sep 7, 2013 | EF0 | 38 km | 0.1 mi | 0 |
| Jun 25, 2005 | EF0 | 62 km | 0.5 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Nearby Volcanoes
1 volcano within 200 km. Closest: Black Rock Desert (135 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Black Rock Desert | Volcanic field | 1,800 m (5,906 ft) | 1290 | 135 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: LEAMINGTON COMPLEX (WASH) (161,203 acres, 1996).
| Year | Name | Acres Burned | Distance |
| 1996 | LEAMINGTON COMPLEX (WASH) | 161,203 | 49 km |
| 2012 | CLAY SPRINGS | 107,391 | 80 km |
| 2018 | POLE CREEK | 102,426 | 23 km |
| 2020 | CANAL | 74,897 | 68 km |
| 2018 | DOLLAR RIDGE | 69,817 | 77 km |
| 1999 | RAILROAD | 64,598 | 54 km |
| 2012 | WOOD HOLLOW | 46,763 | 42 km |
| 2012 | SEELEY | 44,626 | 78 km |
| 2009 | BIG POLE | 41,579 | 96 km |
| 1994 | SIMPSON BT | 36,917 | 84 km |
| 2017 | DAVIS | 35,071 | 75 km |
| 1996 | DAVIS KNOLL COMPLEX (DAVIS KNOLL) | 34,843 | 77 km |
| 2018 | COAL HOLLOW | 30,239 | 43 km |
| 2013 | PATCH SPRINGS | 29,562 | 83 km |
| 2000 | OLDROYD COMPLEX (MONA WEST) | 28,774 | 30 km |
| 1996 | LEAMINGTON COMPLEX (LEAMINGTON) | 28,159 | 71 km |
| 2007 | SALT CREEK | 26,924 | 39 km |
| 2012 | FAUST | 22,155 | 71 km |
| 2005 | DITTO | 22,041 | 93 km |
| 2018 | BALD MOUNTAIN | 21,016 | 16 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 29°F (-2°C) | 1.8 in | Coldest |
| February | 33°F (1°C) | 1.6 in | |
| March | 42°F (5°C) | 1.9 in | |
| April | 48°F (9°C) | 2.2 in | Wettest |
| May | 57°F (14°C) | 1.9 in | |
| June | 67°F (20°C) | 0.9 in | |
| July | 76°F (25°C) | 0.7 in | Warmest, Driest |
| August | 75°F (24°C) | 0.8 in | |
| September | 65°F (18°C) | 1.2 in | |
| October | 51°F (11°C) | 1.8 in | |
| November | 39°F (4°C) | 1.5 in | |
| December | 29°F (-2°C) | 1.9 in |
West Mountain has a seasonal temperature swing of 48°F / from 29°F in January to 76°F in July. Total annual precipitation is 18.4 inches, with April being the wettest month (2.2") and July the driest (0.7").