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Weather & Climate in Ten Sleep, WY
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Ten Sleep experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 26°F in January while summers reach 73°F in July. The area gets 311 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 13.7 inches (drier than the 38-inch national average). The area receives 51.6 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 4,430 feet.
Temperature
26°F Jan (-3°C)
73°F Jul (23°C)
| Annual Average | 47.8°F |
| 11% below US avg | |
| January Average | 26°F (-3°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 311 days/yr |
Geography
| Elevation | 4,430 ft (1,350 m) |
| Area | 0.2 sq mi (0.5 km²) |
| Population Density | 1,126/sq mi |
| Coordinates | 44.0350°N, 107.4483°W |
| Timezone | America/Denver |
| County | Big Horn County County |
| Nearest Airport | Worland Municipal (WRL) 25 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 34.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 31.1 / 100 |
| Social Vulnerability | 52.6 / 100 |
| Community Resilience | 7.7 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Very Low |
| Drought | Relatively Low |
| Cold Wave | Relatively Low |
| Landslide | Relatively High |
| Volcano | Very Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
50 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.0.
| Nov 3, 2017 | 57 km S of Ten Sleep, Wyoming | M4.0 | 58 km | 17 km |
| Oct 10, 1992 | 25 km SSE of Riverton, Wyoming | M4.0 | 150 km | 5 km |
| Aug 22, 2009 | 20 km SSE of Birney, Montana | M4.0 | 146 km | 14 km |
| Feb 25, 1993 | 31 km N of Arvada, Wyoming | M3.9 | 149 km | 5 km |
| Apr 13, 2021 | 51 km S of Ten Sleep, Wyoming | M3.9 | 52 km | 12 km |
| Feb 13, 2023 | Wyoming | M3.7 | 54 km | 10 km |
| Feb 1, 2003 | 11 km E of Antelope Hills, Wyoming | M3.7 | 148 km | 5 km |
| Aug 31, 1992 | 34 km WNW of Kaycee, Wyoming | M3.6 | 40 km | 5 km |
| Jul 4, 2021 | 43 km S of Ten Sleep, Wyoming | M3.6 | 44 km | 17 km |
| Aug 7, 1991 | 31 km NNW of Pavillion, Wyoming | M3.5 | 128 km | 5 km |
| Nov 16, 1993 | 17 km SSE of Ten Sleep, Wyoming | M3.5 | 18 km | 5 km |
| Jan 9, 2007 | 7 km ENE of East Thermopolis, Wyoming | M3.5 | 67 km | 5 km |
| Apr 5, 2002 | 7 km W of South Flat, Wyoming | M3.3 | 53 km | 5 km |
| Sep 3, 2023 | 32 km NW of Kaycee, Wyoming | M3.3 | 44 km | 5 km |
| Oct 31, 2017 | 56 km S of Ten Sleep, Wyoming | M3.2 | 57 km | 15 km |
| Mar 10, 1993 | 27 km W of Midwest, Wyoming | M3.2 | 97 km | 5 km |
| Nov 30, 2012 | 33 km NNE of Powder River, Wyoming | M3.1 | 99 km | 5 km |
| Dec 16, 2012 | 40 km W of Owl Creek, Wyoming | M3.1 | 132 km | 5 km |
| May 10, 2013 | 25 km NW of Wright, Wyoming | M3.1 | 140 km | 9 km |
| Nov 9, 1999 | 58 km ENE of Shoshoni, Wyoming | M3.1 | 62 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
61 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 1 fatality, 4 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Aug 2, 1985 | EF3 | 97 km | 0.2 mi | 0 |
| Jun 1, 2018 | EF2 | 27 km | 1.0 mi | 0 |
| Jun 1, 2018 | EF2 | 24 km | 1.0 mi | 0 |
| Jun 12, 2017 | EF2 | 72 km | 1.6 mi | 0 |
| Jul 10, 2001 | EF2 | 66 km | 0.5 mi | 0 |
| Jul 4, 1978 | EF2 | 68 km | 5.0 mi | 0 |
| Jul 24, 1967 | EF2 | 69 km | 0.1 mi | 0 |
| Jul 9, 1962 | EF2 | 73 km | 0.5 mi | 0 |
| Jun 12, 1962 | EF2 | 91 km | 0.5 mi | 0 |
| Jun 26, 1959 | EF2 | 52 km | 9.2 mi | 1 |
| Jun 3, 1958 | EF2 | 61 km | 0.2 mi | 0 |
| Jun 19, 2019 | EF1 | 31 km | 4.1 mi | 0 |
| Aug 30, 2010 | EF1 | 7 km | 4.6 mi | 0 |
| Jun 1, 2009 | EF1 | 37 km | 0.4 mi | 0 |
| Jun 26, 2001 | EF1 | 69 km | 0.7 mi | 0 |
| Jun 6, 1997 | EF1 | 76 km | 1.0 mi | 0 |
| Jun 15, 1984 | EF1 | 94 km | 1.0 mi | 0 |
| Jun 20, 1977 | EF1 | 69 km | 0.1 mi | 0 |
| May 9, 1977 | EF1 | 61 km | 4.5 mi | 0 |
| Jul 4, 1976 | EF1 | 60 km | 0.2 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: HOUSE DRAW (167,966 acres, 2024).
| Year | Name | Acres Burned | Distance |
| 2024 | HOUSE DRAW | 167,966 | 83 km |
| 1996 | EBLACK MTN | 53,211 | 43 km |
| 1996 | BATES | 47,060 | 45 km |
| 2018 | TEREK | 43,872 | 32 km |
| 2012 | CATO | 26,816 | 94 km |
| 2020 | NEIBER | 17,594 | 43 km |
| 1988 | LOST | 13,081 | 47 km |
| 2007 | BONE CREEK | 12,776 | 69 km |
| 2006 | OUTLAW 2 | 12,279 | 60 km |
| 2020 | RENO | 10,830 | 89 km |
| 1996 | WILLOW | 7,723 | 31 km |
| 1996 | BUFFALO 2 | 7,173 | 20 km |
| 2018 | DENVER JAKE | 6,973 | 39 km |
| 2012 | GILEAD | 5,374 | 60 km |
| 1996 | NBROKENBAC | 4,921 | 17 km |
| 2012 | OTTER CREEK-UPPER BEE | 4,786 | 25 km |
| 2007 | LITTLE GOOSE | 4,767 | 70 km |
| 2000 | MUDDYCRK | 4,601 | 87 km |
| 2007 | COPPER MTN. | 4,458 | 78 km |
| 1992 | UNNAMED | 3,663 | 97 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 26°F (-3°C) | 0.6 in | |
| February | 25°F (-4°C) | 0.5 in | Driest |
| March | 34°F (1°C) | 1.0 in | |
| April | 42°F (6°C) | 1.5 in | |
| May | 52°F (11°C) | 2.0 in | Wettest |
| June | 62°F (17°C) | 1.8 in | |
| July | 73°F (23°C) | 0.9 in | Warmest |
| August | 68°F (20°C) | 0.8 in | |
| September | 57°F (14°C) | 1.3 in | |
| October | 46°F (8°C) | 1.1 in | |
| November | 31°F (-0°C) | 0.7 in | |
| December | 22°F (-6°C) | 0.6 in | Coldest |
Ten Sleep has a seasonal temperature swing of 51°F / from 22°F in December to 73°F in July. Total annual precipitation is 12.8 inches, with May being the wettest month (2.0") and February the driest (0.5").