Weather & Climate in Thermopolis, WY

Temperature, precipitation, air quality, natural hazards, and monthly weather data.

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 4,334 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	4,334 ft (1,321 m)
Area	2.5 sq mi (6.4 km²)
Population Density	1,136/sq mi
Coordinates	43.6476°N, 108.2145°W
Timezone	America/Denver
County	Hot Springs County County
Nearest Airport	Worland Municipal (WRL) 25 miles away

Precipitation & Snow

Annual Rainfall 12.0"

69% below US avg

Snowfall 27.4"

Wettest Month (May) 2.05"

Driest Month (Feb) 0.35"

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

63 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	105 km	76 km
Sep 27, 2001	35 km WSW of Dubois, Wyoming	M4.3	150 km	5 km
Nov 3, 2017	57 km S of Ten Sleep, Wyoming	M4.0	68 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	69 km	12 km
Feb 13, 2023	Wyoming	M3.7	66 km	10 km
Oct 21, 1996	42 km ESE of Boulder, Wyoming	M3.7	149 km	5 km
May 17, 2009	24 km WNW of Jeffrey City, Wyoming	M3.7	123 km	5 km
Aug 31, 1992	34 km WNW of Kaycee, Wyoming	M3.6	96 km	5 km
Jul 4, 2021	43 km S of Ten Sleep, Wyoming	M3.6	67 km	17 km
Jan 9, 2007	7 km ENE of East Thermopolis, Wyoming	M3.5	9 km	5 km
Aug 7, 1991	31 km NNW of Pavillion, Wyoming	M3.5	55 km	5 km
Nov 16, 1993	17 km SSE of Ten Sleep, Wyoming	M3.5	72 km	5 km
Sep 3, 2023	32 km NW of Kaycee, Wyoming	M3.3	107 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	63 km	15 km
Jan 29, 2012	27 km ENE of Atlantic City, Wyoming	M3.2	120 km	5 km
Mar 10, 1993	27 km W of Midwest, Wyoming	M3.2	132 km	5 km
Aug 19, 2000	36 km W of Jeffrey City, Wyoming	M3.2	122 km	5 km
Aug 23, 1993	23 km WNW of Dubois, Wyoming	M3.1	138 km	5 km

Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

53 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	99 km	1.0 mi	0
Jun 1, 2018	EF2	94 km	1.0 mi	0
Jul 10, 2001	EF2	20 km	0.5 mi	0
Jun 7, 1986	EF2	48 km	2.0 mi	0
Jul 4, 1978	EF2	96 km	5.0 mi	0
Jul 24, 1967	EF2	80 km	0.1 mi	0
Jun 6, 1967	EF2	62 km	8.2 mi	0
Jul 9, 1962	EF2	80 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	69 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
Aug 3, 1976	EF1	70 km	0.1 mi	0
Jul 4, 1976	EF1	83 km	0.2 mi	0
Aug 14, 1974	EF1	95 km	1.5 mi	0
Jun 20, 1974	EF1	83 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: KATESBASIN (141,128 acres, 2000).

Year	Name	Acres Burned	Distance
2000	KATESBASIN	141,128	27 km
1996	EBLACK MTN	53,211	34 km
1996	BATES	47,060	55 km
2018	TEREK	43,872	66 km
2020	NEIBER	17,594	32 km
1999	ROOSTER	9,624	70 km
1996	WILLOW	7,723	69 km
1996	BUFFALO 2	7,173	61 km
2018	DENVER JAKE	6,973	38 km
1996	NBROKENBAC	4,921	88 km
2012	OTTER CREEK-UPPER BEE	4,786	77 km
2000	MUDDYCRK	4,601	12 km
2000	MIDDLECREE	4,534	63 km
1996	ANTLER	4,492	69 km
2007	COPPER MTN.	4,458	16 km
2018	ZIMMERMAN	3,655	24 km
2001	RENNER DRA	3,627	66 km
1999	LOWER GRAS	3,489	57 km
2017	BANJO	3,379	41 km
1998	LARSEN 1	3,157	61 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

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").

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