Weather & Climate in Arapahoe, WY

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

Arapahoe has a cool climate with an average annual temperature of 44°F (7°C). Winters average 16°F in January while summers reach 71°F in July. The area gets 310 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 9.5 inches (drier than the 38-inch national average). The area receives 44.3 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 5,077 feet.

Temperature

16°F Jan (-9°C) 71°F Jul (22°C)

Annual Average	43.9°F
	19% below US avg
January Average	16°F (-9°C)
July Average	71°F (22°C)
Sunny Days	310 days/yr

Geography

Elevation	5,077 ft (1,547 m)
Area	27.6 sq mi (71.6 km²)
Population Density	53/sq mi
Coordinates	42.9926°N, 108.4527°W
Timezone	America/Denver
County	Fremont County County
Nearest Airport	Central Wyoming Regional (RIW) 5 miles away

Precipitation & Snow

Annual Rainfall 9.5"

75% below US avg

Snowfall 44.3"

Wettest Month (May) 1.81"

Driest Month (Feb) 0.24"

Air Quality

AQI Median	34.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively Low
Risk Score	59.7 / 100
Social Vulnerability	52.8 / 100
Community Resilience	11.8 / 100

Hazard Breakdown

Tornado	Very Low
Earthquake	Relatively Low
Wildfire	Relatively Moderate
Flood	Relatively Low
Hail	Relatively Low
Strong Wind	Relatively Low
Heat Wave	Very Low
Winter Weather	Relatively Moderate
Lightning	Relatively High
Ice Storm	Very Low
Drought	Relatively Low
Cold Wave	Relatively Moderate
Landslide	Relatively Moderate
Volcano	Very Low
Avalanche	Relatively Moderate

Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

71 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	55 km	76 km
Dec 28, 1993	38 km NE of Bondurant, Wyoming	M4.7	147 km	8 km
Sep 27, 2001	35 km WSW of Dubois, Wyoming	M4.3	140 km	5 km
May 26, 2000	5 km S of Bairoil, Wyoming	M4.0	114 km	5 km
Nov 3, 2017	57 km S of Ten Sleep, Wyoming	M4.0	104 km	17 km
Oct 10, 1992	25 km SSE of Riverton, Wyoming	M4.0	26 km	5 km
Apr 13, 2021	51 km S of Ten Sleep, Wyoming	M3.9	109 km	12 km
Apr 1, 2011	22 km NW of Daniel, Wyoming	M3.9	148 km	5 km
Feb 13, 2023	Wyoming	M3.7	105 km	10 km
May 17, 2009	24 km WNW of Jeffrey City, Wyoming	M3.7	57 km	5 km
Oct 21, 1996	42 km ESE of Boulder, Wyoming	M3.7	83 km	5 km
Jun 22, 1996	40 km ESE of Kelly, Wyoming	M3.7	149 km	5 km
Jun 1, 1993	6 km N of Bairoil, Wyoming	M3.7	105 km	5 km
Jul 4, 2021	43 km S of Ten Sleep, Wyoming	M3.6	113 km	17 km
Aug 31, 1992	34 km WNW of Kaycee, Wyoming	M3.6	147 km	5 km
Jun 30, 1998	8 km NNW of Point of Rocks, Wyoming	M3.6	141 km	6 km
Aug 7, 1991	31 km NNW of Pavillion, Wyoming	M3.5	66 km	5 km
Aug 13, 2004	35 km SW of Alcova, Wyoming	M3.5	145 km	5 km
Nov 16, 1993	17 km SSE of Ten Sleep, Wyoming	M3.5	131 km	5 km
Jan 9, 2007	7 km ENE of East Thermopolis, Wyoming	M3.5	80 km	5 km

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

Tornado History

26 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 3 injuries.

Date	Rating	Distance	Path	Fatalities
Jun 16, 1962	EF3	24 km	0.5 mi	0
Jul 10, 2001	EF2	95 km	0.5 mi	0
Jun 7, 1986	EF2	37 km	2.0 mi	0
Aug 27, 1973	EF2	56 km	0.5 mi	0
Jun 6, 1967	EF2	15 km	8.2 mi	0
May 6, 2014	EF1	35 km	1.5 mi	0
Jun 6, 1997	EF1	11 km	2.0 mi	0
Aug 3, 1980	EF1	38 km	0.1 mi	0
Aug 3, 1976	EF1	48 km	0.1 mi	0
Jun 6, 1968	EF1	16 km	3.0 mi	0
Jun 5, 1968	EF1	8 km	0.1 mi	0
Jun 14, 1967	EF1	6 km	0.5 mi	0
Apr 23, 1964	EF1	31 km	0.5 mi	0
Sep 9, 2024	EF0	75 km	0.2 mi	0
Aug 11, 2020	EF0	16 km	0.2 mi	0
May 28, 2018	EF0	77 km	0.5 mi	0
Jun 3, 2014	EF0	92 km	2.2 mi	0
May 6, 2014	EF0	26 km	4.8 mi	0
Jun 14, 2009	EF0	81 km	0.7 mi	0
Jun 3, 2009	EF0	86 km	0.9 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	62 km
1996	EBLACK MTN	53,211	100 km
2012	ALPINE LAKE	39,158	70 km
1988	FAYETTE	29,234	93 km
2002	SOUTH FORK II	13,803	50 km
2002	PASS CREEK	13,724	45 km
2000	MUDDYCRK	4,601	70 km
2007	COPPER MTN.	4,458	65 km
2018	ZIMMERMAN	3,655	93 km
1989	ANNS	3,298	67 km
2002	DIVIDE	2,831	83 km
2023	BLACK MOUNTAIN	2,596	96 km
2018	POTTER BUTTE	2,444	98 km
2022	WASHAKIE PARK	2,337	55 km
1988	WISE FLAT	2,232	55 km
2018	BLACK MOUNTAIN	2,178	86 km
2001	BEAVER RIM	2,171	43 km
2000	SPRING MNT	1,820	86 km
2000	MURPHYDRAW	1,615	43 km
1994	17 MILE 6	1,564	8 km

Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	16°F (-9°C)	0.3 in	Coldest
February	24°F (-5°C)	0.2 in	Driest
March	36°F (2°C)	0.5 in
April	44°F (7°C)	1.2 in
May	54°F (12°C)	1.8 in	Wettest
June	64°F (18°C)	1.1 in
July	71°F (22°C)	0.7 in	Warmest
August	70°F (21°C)	0.5 in
September	59°F (15°C)	0.9 in
October	46°F (8°C)	0.8 in
November	30°F (-1°C)	0.5 in
December	19°F (-7°C)	0.3 in

Arapahoe has a seasonal temperature swing of 55°F / from 16°F in January to 71°F in July. Total annual precipitation is 8.8 inches, with May being the wettest month (1.8") and February the driest (0.2").

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