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Weather & Climate in Lyman, WY
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Lyman has a cool climate with an average annual temperature of 41°F (5°C). Winters average 22°F in January while summers reach 63°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 11.0 inches (drier than the 38-inch national average). The area receives 63.8 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 34. The city sits at an elevation of 6,713 feet.
Temperature
22°F Jan (-6°C)
63°F Jul (17°C)
| Annual Average | 40.8°F |
| 24% below US avg | |
| January Average | 22°F (-6°C) |
| July Average | 63°F (17°C) |
| Sunny Days | 316 days/yr |
Geography
| Elevation | 6,713 ft (2,046 m) |
| Area | 1.6 sq mi (4.1 km²) |
| Population Density | 1,132/sq mi |
| Coordinates | 41.3275°N, 110.2974°W |
| Timezone | America/Denver |
| County | Uinta County County |
| Nearest Airport | Southwest Wyoming Regional (RKS) 66 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
195 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.9.
| Apr 15, 2010 | 9 km NE of Randolph, Utah | M4.9 | 79 km | 10 km |
| Apr 8, 1994 | 13 km SW of Smoot, Wyoming | M4.3 | 149 km | 5 km |
| Apr 7, 1994 | 11 km SW of Smoot, Wyoming | M4.3 | 150 km | 5 km |
| Jan 30, 2000 | 8 km ESE of Little America, Wyoming | M4.3 | 49 km | 5 km |
| May 25, 2016 | 15 km NNE of Tabiona, Utah | M4.0 | 98 km | 16 km |
| May 1, 2025 | 4 km WNW of Independence, Utah | M3.9 | 141 km | 14 km |
| Mar 1, 2013 | 7 km SW of Smoot, Wyoming | M3.9 | 149 km | 5 km |
| Mar 1, 1995 | 20 km SW of Smoot, Wyoming | M3.9 | 146 km | 4 km |
| Feb 25, 2007 | Wyoming | M3.8 | 130 km | -2 km |
| Apr 9, 1994 | 5 km SW of Smoot, Wyoming | M3.8 | 150 km | 5 km |
| Jul 17, 1997 | 9 km E of Bennington, Idaho | M3.8 | 142 km | 4 km |
| Mar 2, 1991 | 27 km SSW of Jensen, Utah | M3.7 | 149 km | -3 km |
| Aug 31, 2023 | 15 km ENE of Wolf Creek, Utah | M3.7 | 113 km | 12 km |
| Jul 26, 2011 | 15 km WSW of Saint Charles, Idaho | M3.7 | 132 km | 0 km |
| Jun 9, 2021 | 17 km E of Independence, Utah | M3.7 | 130 km | 10 km |
| Oct 17, 2013 | 13 km NE of Avon, Utah | M3.6 | 120 km | 11 km |
| Jan 3, 2003 | 3 km SSE of Eden, Utah | M3.6 | 126 km | 13 km |
| Oct 27, 2000 | 6 km SW of Bennington, Idaho | M3.6 | 145 km | 6 km |
| Nov 11, 2000 | 14 km SE of Jensen, Utah | M3.6 | 148 km | -3 km |
| Jul 28, 2002 | 10 km SSW of Laketown, Utah | M3.6 | 101 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
24 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 6 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 10, 1950 | EF2 | 19 km | 2.0 mi | 0 |
| Jul 10, 2001 | EF1 | 51 km | 5.0 mi | 0 |
| Apr 20, 2001 | EF1 | 64 km | 0.2 mi | 0 |
| Apr 14, 2000 | EF1 | 64 km | 0.5 mi | 0 |
| Aug 20, 1998 | EF1 | 100 km | 0.1 mi | 0 |
| Jul 31, 1978 | EF1 | 99 km | 1.0 mi | 0 |
| Jun 27, 1974 | EF1 | 72 km | 0.1 mi | 0 |
| Sep 9, 1973 | EF1 | 71 km | 0.1 mi | 0 |
| Jun 23, 1965 | EF1 | 74 km | 0.6 mi | 0 |
| May 28, 2018 | EF0 | 42 km | 3.5 mi | 0 |
| Jun 16, 2015 | EF0 | 100 km | 1.0 mi | 0 |
| May 7, 2014 | EF0 | 99 km | 0.5 mi | 0 |
| Sep 15, 2013 | EF0 | 79 km | 0.1 mi | 0 |
| Aug 21, 2001 | EF0 | 77 km | 2.0 mi | 0 |
| Jun 10, 1997 | EF0 | 81 km | 0.1 mi | 0 |
| Sep 9, 1991 | EF0 | 99 km | 0.5 mi | 0 |
| Sep 9, 1991 | EF0 | 94 km | 0.4 mi | 0 |
| May 2, 1991 | EF0 | 95 km | 0.1 mi | 0 |
| Aug 4, 1990 | EF0 | 96 km | 0.1 mi | 0 |
| May 30, 1989 | EF0 | 27 km | 0.5 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 | 85 km |
| 2007 | NEOLA NORTH | 46,909 | 89 km |
| 2000 | WLD HORSE | 41,881 | 77 km |
| 2000 | SHEEP MT | 31,393 | 88 km |
| 2002 | MUSTANG | 20,607 | 90 km |
| 1988 | WHITEROCKS | 18,885 | 95 km |
| 1999 | BRIDGER BA | 15,227 | 65 km |
| 2018 | NORTH EDEN | 14,398 | 95 km |
| 2002 | GARDEN VALLEY COMPLEX (EAST FORK) | 14,245 | 63 km |
| 2007 | RED CANYON RX BURN-H | 13,464 | 58 km |
| 1994 | DRY CANYON 2 | 10,927 | 89 km |
| 2020 | RICHARD MTN | 7,802 | 94 km |
| 2010 | POLE CREEK STANDS | 6,900 | 95 km |
| 2010 | WINDMILL | 5,935 | 40 km |
| 1989 | UINTA CANYON | 5,834 | 76 km |
| 1988 | LITTLEBRYN | 5,300 | 40 km |
| 2005 | NORTH NEOLA | 5,195 | 97 km |
| 2018 | MURDOCK | 5,169 | 87 km |
| 1985 | WEYMAN | 5,058 | 64 km |
| 2016 | BOX CANYON | 4,479 | 94 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 22°F (-6°C) | 0.4 in | Coldest |
| February | 24°F (-5°C) | 0.4 in | Driest |
| March | 32°F (-0°C) | 0.7 in | |
| April | 39°F (4°C) | 1.0 in | |
| May | 49°F (9°C) | 1.1 in | Wettest |
| June | 58°F (14°C) | 1.0 in | |
| July | 63°F (17°C) | 0.8 in | |
| August | 64°F (18°C) | 0.8 in | Warmest |
| September | 54°F (12°C) | 0.9 in | |
| October | 43°F (6°C) | 0.8 in | |
| November | 30°F (-1°C) | 0.6 in | |
| December | 22°F (-6°C) | 0.5 in |
Lyman has a seasonal temperature swing of 42°F / from 22°F in January to 64°F in August. Total annual precipitation is 9.1 inches, with May being the wettest month (1.1") and February the driest (0.4").