All Countries
Weather & Climate in East Thermopolis, WY
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
East Thermopolis experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 24°F in January while summers reach 75°F in July. The area gets 302 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 12.0 inches (drier than the 38-inch national average). The area receives 27.4 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 34. The city sits at an elevation of 4,330 feet.
Temperature
24°F Jan (-4°C)
75°F Jul (24°C)
| Annual Average | 48.6°F |
| 10% below US avg | |
| January Average | 24°F (-4°C) |
| July Average | 75°F (24°C) |
| Sunny Days | 302 days/yr |
Geography
| Elevation | 4,330 ft (1,320 m) |
| Area | 0.2 sq mi (0.5 km²) |
| Population Density | 1,033/sq mi |
| Coordinates | 43.6441°N, 108.1979°W |
| Timezone | America/Denver |
| County | Hot Springs 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 | 16.1 / 100 |
| Social Vulnerability | 73.4 / 100 |
| Community Resilience | 13.1 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Relatively Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Very Low |
| Winter Weather | Very Low |
| Lightning | Relatively Low |
| Ice Storm | Very Low |
| Drought | Very Low |
| Cold Wave | Relatively Low |
| Landslide | Relatively Moderate |
| Volcano | Very Low |
| Avalanche | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
62 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.8.
| Sep 21, 2013 | 20 km W of Fort Washakie, Wyoming | M4.8 | 106 km | 76 km |
| Nov 3, 2017 | 57 km S of Ten Sleep, Wyoming | M4.0 | 67 km | 17 km |
| Oct 10, 1992 | 25 km SSE of Riverton, Wyoming | M4.0 | 92 km | 5 km |
| Apr 13, 2021 | 51 km S of Ten Sleep, Wyoming | M3.9 | 67 km | 12 km |
| May 17, 2009 | 24 km WNW of Jeffrey City, Wyoming | M3.7 | 123 km | 5 km |
| Oct 21, 1996 | 42 km ESE of Boulder, Wyoming | M3.7 | 150 km | 5 km |
| Feb 13, 2023 | Wyoming | M3.7 | 65 km | 10 km |
| Jul 4, 2021 | 43 km S of Ten Sleep, Wyoming | M3.6 | 66 km | 17 km |
| Aug 31, 1992 | 34 km WNW of Kaycee, Wyoming | M3.6 | 95 km | 5 km |
| Aug 7, 1991 | 31 km NNW of Pavillion, Wyoming | M3.5 | 56 km | 5 km |
| Nov 16, 1993 | 17 km SSE of Ten Sleep, Wyoming | M3.5 | 71 km | 5 km |
| Jan 9, 2007 | 7 km ENE of East Thermopolis, Wyoming | M3.5 | 8 km | 5 km |
| Sep 3, 2023 | 32 km NW of Kaycee, Wyoming | M3.3 | 106 km | 5 km |
| Apr 5, 2002 | 7 km W of South Flat, Wyoming | M3.3 | 34 km | 5 km |
| Oct 31, 2017 | 56 km S of Ten Sleep, Wyoming | M3.2 | 61 km | 15 km |
| Aug 19, 2000 | 36 km W of Jeffrey City, Wyoming | M3.2 | 121 km | 5 km |
| Mar 10, 1993 | 27 km W of Midwest, Wyoming | M3.2 | 130 km | 5 km |
| Jan 29, 2012 | 27 km ENE of Atlantic City, Wyoming | M3.2 | 120 km | 5 km |
| Dec 16, 2012 | 40 km W of Owl Creek, Wyoming | M3.1 | 72 km | 5 km |
| Feb 1, 2011 | 35 km W of Jeffrey City, Wyoming | M3.1 | 122 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
54 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 6 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 16, 1962 | EF3 | 91 km | 0.5 mi | 0 |
| Jun 1, 2018 | EF2 | 93 km | 1.0 mi | 0 |
| Jun 1, 2018 | EF2 | 97 km | 1.0 mi | 0 |
| Jul 10, 2001 | EF2 | 21 km | 0.5 mi | 0 |
| Jun 7, 1986 | EF2 | 48 km | 2.0 mi | 0 |
| Jul 4, 1978 | EF2 | 97 km | 5.0 mi | 0 |
| Jul 24, 1967 | EF2 | 81 km | 0.1 mi | 0 |
| Jun 6, 1967 | EF2 | 62 km | 8.2 mi | 0 |
| Jul 9, 1962 | EF2 | 81 km | 0.5 mi | 0 |
| Jun 12, 1962 | EF2 | 94 km | 0.5 mi | 0 |
| May 6, 2014 | EF1 | 40 km | 1.5 mi | 0 |
| Aug 30, 2010 | EF1 | 68 km | 4.6 mi | 0 |
| Jun 1, 2009 | EF1 | 74 km | 0.4 mi | 0 |
| Jun 26, 2001 | EF1 | 94 km | 0.7 mi | 0 |
| Jun 6, 1997 | EF1 | 75 km | 2.0 mi | 0 |
| Aug 3, 1980 | EF1 | 47 km | 0.1 mi | 0 |
| Jun 20, 1977 | EF1 | 99 km | 0.1 mi | 0 |
| Aug 3, 1976 | EF1 | 69 km | 0.1 mi | 0 |
| Jul 4, 1976 | EF1 | 83 km | 0.2 mi | 0 |
| Aug 14, 1974 | EF1 | 94 km | 1.5 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: KATESBASIN (141,128 acres, 2000).
| Year | Name | Acres Burned | Distance |
| 2000 | KATESBASIN | 141,128 | 28 km |
| 1996 | EBLACK MTN | 53,211 | 33 km |
| 1996 | BATES | 47,060 | 54 km |
| 2018 | TEREK | 43,872 | 66 km |
| 2020 | NEIBER | 17,594 | 32 km |
| 2006 | OUTLAW 2 | 12,279 | 99 km |
| 1999 | ROOSTER | 9,624 | 72 km |
| 1996 | WILLOW | 7,723 | 68 km |
| 1996 | BUFFALO 2 | 7,173 | 60 km |
| 2018 | DENVER JAKE | 6,973 | 37 km |
| 1996 | NBROKENBAC | 4,921 | 87 km |
| 2012 | OTTER CREEK-UPPER BEE | 4,786 | 76 km |
| 2000 | MUDDYCRK | 4,601 | 14 km |
| 2000 | MIDDLECREE | 4,534 | 64 km |
| 1996 | ANTLER | 4,492 | 71 km |
| 2007 | COPPER MTN. | 4,458 | 15 km |
| 2018 | ZIMMERMAN | 3,655 | 23 km |
| 2001 | RENNER DRA | 3,627 | 68 km |
| 1999 | LOWER GRAS | 3,489 | 58 km |
| 2017 | BANJO | 3,379 | 41 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 24°F (-4°C) | 0.4 in | |
| February | 26°F (-3°C) | 0.4 in | Driest |
| March | 35°F (2°C) | 0.8 in | |
| April | 44°F (6°C) | 1.5 in | |
| May | 53°F (12°C) | 2.1 in | Wettest |
| June | 64°F (18°C) | 1.6 in | |
| July | 75°F (24°C) | 0.8 in | Warmest |
| August | 70°F (21°C) | 0.8 in | |
| September | 59°F (15°C) | 1.1 in | |
| October | 46°F (8°C) | 0.9 in | |
| November | 31°F (-0°C) | 0.5 in | |
| December | 22°F (-6°C) | 0.4 in | Coldest |
East Thermopolis has a seasonal temperature swing of 53°F / from 22°F in December to 75°F in July. Total annual precipitation is 11.0 inches, with May being the wettest month (2.1") and February the driest (0.4").