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Weather & Climate in Evanston, WY
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Evanston has a cool climate with an average annual temperature of 42°F (6°C). Winters average 22°F in January while summers reach 64°F in July. The area gets 316 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 12.1 inches (drier than the 38-inch national average). Air quality is rated Good with a median AQI of 34. The city sits at an elevation of 6,780 feet.
Temperature
22°F Jan (-6°C)
64°F Jul (18°C)
| Annual Average | 42.0°F |
| 22% below US avg | |
| January Average | 22°F (-6°C) |
| July Average | 64°F (18°C) |
| Sunny Days | 316 days/yr |
Geography
| Elevation | 6,780 ft (2,067 m) |
| Area | 10.3 sq mi (26.7 km²) |
| Population Density | 1,149/sq mi |
| Coordinates | 41.2601°N, 110.9637°W |
| Timezone | America/Denver |
| County | Uinta County County |
| Nearest Airport | Brigham City Regional (BMC) 60 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 34.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 16.7 / 100 |
| Social Vulnerability | 15.0 / 100 |
| Community Resilience | 12.5 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Relatively Low |
| Flood | Very Low |
| Hail | Very Low |
| Strong Wind | Relatively Low |
| Heat Wave | No Rating |
| Winter Weather | Relatively High |
| Lightning | Relatively Moderate |
| Ice Storm | Very Low |
| Drought | Very Low |
| Cold Wave | Very Low |
| Landslide | Relatively Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
521 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 | 109 km | 12 km |
| Sep 10, 2017 | 9 km NNW of Georgetown, Idaho | M5.0 | 150 km | 10 km |
| Apr 15, 2010 | 9 km NE of Randolph, Utah | M4.9 | 52 km | 10 km |
| Sep 11, 2017 | 9 km NW of Georgetown, Idaho | M4.7 | 148 km | 8 km |
| Mar 18, 2020 | 6 km NNE of Magna, Utah | M4.6 | 108 km | 9 km |
| Mar 18, 2020 | 5 km NE of Magna, Utah | M4.6 | 108 km | 11 km |
| Jan 26, 2018 | 5 km NNW of Georgetown, Idaho | M4.4 | 146 km | 10 km |
| May 5, 2024 | 16 km SW of Thatcher, Utah | M4.4 | 126 km | 7 km |
| Sep 11, 2017 | 9 km NNW of Georgetown, Idaho | M4.3 | 149 km | 2 km |
| Apr 7, 1994 | 11 km SW of Smoot, Wyoming | M4.3 | 145 km | 5 km |
| Apr 8, 1994 | 13 km SW of Smoot, Wyoming | M4.3 | 143 km | 5 km |
| Jun 30, 2006 | 12 km WSW of Georgetown, Idaho | M4.3 | 138 km | 10 km |
| Jan 30, 2000 | 8 km ESE of Little America, Wyoming | M4.3 | 104 km | 5 km |
| Apr 16, 2020 | 4 km NE of Magna, Utah | M4.2 | 109 km | 10 km |
| Mar 18, 2020 | 1 km NNW of Magna, Utah | M4.2 | 113 km | 9 km |
| Apr 15, 2020 | 4 km NE of Magna, Utah | M4.2 | 109 km | 9 km |
| Mar 16, 1992 | 6 km S of Herriman, Utah | M4.2 | 128 km | 12 km |
| Sep 10, 2017 | 9 km NNW of Georgetown, Idaho | M4.1 | 150 km | 13 km |
| Sep 9, 2017 | 9 km NNW of Georgetown, Idaho | M4.1 | 150 km | 7 km |
| Sep 11, 2017 | 9 km NW of Georgetown, Idaho | M4.1 | 149 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
36 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 1 fatality, 96 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Aug 11, 1999 | EF2 | 96 km | 4.3 mi | 1 |
| Aug 14, 1968 | EF2 | 93 km | 1.5 mi | 0 |
| Jun 3, 1963 | EF2 | 88 km | 2.0 mi | 0 |
| May 10, 1950 | EF2 | 46 km | 2.0 mi | 0 |
| Sep 2, 2021 | EF1 | 93 km | 2.1 mi | 0 |
| Sep 22, 2016 | EF1 | 88 km | 2.9 mi | 0 |
| Jul 10, 2001 | EF1 | 90 km | 5.0 mi | 0 |
| Aug 20, 1998 | EF1 | 43 km | 0.1 mi | 0 |
| May 29, 1996 | EF1 | 84 km | 1.3 mi | 0 |
| Jun 2, 1993 | EF1 | 93 km | 1.0 mi | 0 |
| Sep 23, 1992 | EF1 | 95 km | 2.0 mi | 0 |
| Aug 14, 1968 | EF1 | 94 km | 0.1 mi | 0 |
| Jun 23, 1965 | EF1 | 31 km | 0.6 mi | 0 |
| May 25, 1954 | EF1 | 69 km | 0.5 mi | 0 |
| May 28, 2018 | EF0 | 93 km | 3.5 mi | 0 |
| May 3, 2009 | EF0 | 91 km | 1.0 mi | 0 |
| Aug 2, 2005 | EF0 | 97 km | 5.0 mi | 0 |
| Aug 21, 2001 | EF0 | 87 km | 0.1 mi | 0 |
| Sep 12, 1998 | EF0 | 84 km | 0.1 mi | 0 |
| Jun 4, 1998 | EF0 | 87 km | 0.1 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: EAST FORK (106,432 acres, 2020).
| Year | Name | Acres Burned | Distance |
| 2020 | EAST FORK | 106,432 | 79 km |
| 1999 | BRIDGER BA | 15,227 | 47 km |
| 2018 | NORTH EDEN | 14,398 | 79 km |
| 2002 | GARDEN VALLEY COMPLEX (EAST FORK) | 14,245 | 48 km |
| 2007 | RED CANYON RX BURN-H | 13,464 | 53 km |
| 1994 | DRY CANYON 2 | 10,927 | 51 km |
| 2010 | POLE CREEK STANDS | 6,900 | 99 km |
| 2010 | WINDMILL | 5,935 | 17 km |
| 1989 | UINTA CANYON | 5,834 | 97 km |
| 1988 | AFFLECK PARK | 5,748 | 81 km |
| 1988 | LITTLEBRYN | 5,300 | 18 km |
| 2018 | MURDOCK | 5,169 | 66 km |
| 2012 | HELLS HOLLOW | 4,758 | 72 km |
| 2016 | BOX CANYON | 4,479 | 62 km |
| 2005 | ROCK CREEK RX | 4,302 | 71 km |
| 1994 | EDGAR CANYON | 4,260 | 72 km |
| 2005 | SHEEP CREEK WFU | 4,128 | 99 km |
| 1992 | PIONEER | 3,972 | 61 km |
| 1999 | EAGLE CANYON | 3,936 | 48 km |
| 1992 | DESERET/SPRING CANYON | 3,861 | 24 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 22°F (-6°C) | 0.8 in | |
| February | 22°F (-6°C) | 0.6 in | Driest |
| March | 30°F (-1°C) | 0.8 in | |
| April | 38°F (3°C) | 1.1 in | |
| May | 47°F (8°C) | 1.4 in | Wettest |
| June | 55°F (13°C) | 1.1 in | |
| July | 64°F (18°C) | 0.9 in | Warmest |
| August | 62°F (17°C) | 1.0 in | |
| September | 53°F (12°C) | 1.2 in | |
| October | 42°F (6°C) | 1.1 in | |
| November | 29°F (-2°C) | 0.9 in | |
| December | 21°F (-6°C) | 0.8 in | Coldest |
Evanston has a seasonal temperature swing of 44°F / from 21°F in December to 64°F in July. Total annual precipitation is 11.5 inches, with May being the wettest month (1.4") and February the driest (0.6").