Weather & Climate in Sleepy Hollow, WY

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

Sleepy Hollow experiences four distinct seasons with an average annual temperature of 47°F (8°C). Winters average 26°F in January while summers reach 72°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 17.6 inches (drier than the 38-inch national average). The area receives 55.7 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 4,577 feet.

Temperature

26°F Jan (-3°C) 72°F Jul (22°C)

Annual Average	46.8°F
	13% below US avg
January Average	26°F (-3°C)
July Average	72°F (22°C)
Sunny Days	311 days/yr

Geography

Elevation	4,577 ft (1,395 m)
Area	0.4 sq mi (1.1 km²)
Population Density	4,314/sq mi
Coordinates	44.2327°N, 105.4309°W
Timezone	America/Denver
County	Campbell County County
Nearest Airport	Northeast Wyoming Regional (GCC) 10 miles away

Precipitation & Snow

Annual Rainfall 17.6"

54% below US avg

Snowfall 55.7"

Wettest Month (Jun) 2.80"

Driest Month (Jan) 0.47"

Air Quality

AQI Median	34.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively Low
Risk Score	56.1 / 100
Social Vulnerability	10.6 / 100
Community Resilience	8.2 / 100

Hazard Breakdown

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

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

Earthquake History

35 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.2.

Sep 25, 2009	15 km E of Alzada, Montana	M4.2	130 km	5 km
Oct 19, 1996	21 km E of Antelope Hills, Wyoming	M4.2	137 km	5 km
Aug 22, 2009	20 km SSE of Birney, Montana	M4.0	129 km	14 km
Feb 25, 1993	31 km N of Arvada, Wyoming	M3.9	92 km	5 km
Aug 29, 2004	16 km NNW of Douglas, Wyoming	M3.8	150 km	5 km
Aug 2, 2021	12 km NW of Rolling Hills, Wyoming	M3.8	144 km	10 km
Feb 6, 1996	13 km WNW of Hill City, South Dakota	M3.7	139 km	5 km
Feb 1, 2003	11 km E of Antelope Hills, Wyoming	M3.7	142 km	5 km
Aug 31, 1992	34 km WNW of Kaycee, Wyoming	M3.6	137 km	5 km
Feb 15, 2004	19 km N of Douglas, Wyoming	M3.5	144 km	10 km
Nov 3, 1999	8 km NNW of Broadus, Montana	M3.5	142 km	10 km
Sep 3, 2023	32 km NW of Kaycee, Wyoming	M3.3	125 km	5 km
Jul 22, 2020	16 km NW of Rolling Hills, Wyoming	M3.2	146 km	34 km
Mar 10, 1993	27 km W of Midwest, Wyoming	M3.2	133 km	5 km
May 10, 2013	25 km NW of Wright, Wyoming	M3.1	41 km	9 km
Jun 30, 1993	25 km N of Douglas, Wyoming	M3.0	139 km	5 km
Sep 27, 2016	43 km WSW of Gillette, Wyoming	M3.0	47 km	14 km
Oct 25, 2009	34 km S of Buffalo, Wyoming	M3.0	100 km	5 km
Jun 29, 2024	22 km ESE of Hill View Heights, Wyoming	M3.0	134 km	10 km
May 25, 2018	45 km W of Biddle, Montana	M2.9	102 km	16 km

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

Tornado History

157 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 2 fatalities, 35 injuries.

Date	Rating	Distance	Path	Fatalities
Jun 1, 2018	EF3	25 km	3.8 mi	0
May 23, 1978	EF3	26 km	14.5 mi	0
Jun 25, 1975	EF3	86 km	11.5 mi	0
Jul 12, 1965	EF3	94 km	20.8 mi	0
Jun 23, 2023	EF2	82 km	3.8 mi	0
Jun 13, 2014	EF2	87 km	16.5 mi	0
Jul 13, 2009	EF2	89 km	9.4 mi	0
Aug 12, 2005	EF2	56 km	1.5 mi	2
May 6, 1988	EF2	9 km	1.5 mi	0
May 10, 1985	EF2	84 km	1.0 mi	0
May 31, 1984	EF2	39 km	0.5 mi	0
Jul 30, 1975	EF2	58 km	12.4 mi	0
Jun 25, 1975	EF2	9 km	16.3 mi	0
Jul 22, 1966	EF2	9 km	3.6 mi	0
Jul 2, 1964	EF2	82 km	0.1 mi	0
May 18, 1961	EF2	70 km	0.1 mi	0
Jun 25, 1959	EF2	73 km	1.0 mi	0
May 27, 1959	EF2	14 km	10.6 mi	0
Jun 12, 1958	EF2	96 km	1.0 mi	0
Jun 12, 1953	EF2	42 km	2.0 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	80 km
2012	OIL CREEK	63,182	94 km
2024	FLAT ROCK	50,782	37 km
2006	BUFFALO CREEK	37,630	99 km
2024	SHORT DRAW	33,733	93 km
2012	CATO	26,816	87 km
2024	CONSTITUTION	23,963	39 km
1999	CLARKELEN	21,432	39 km
2024	WILDCAT CREEK	18,751	80 km
2006	THORN DIVIDE COMPLEX	15,261	57 km
1994	BARREL SPR	13,526	98 km
1991	HORSLEY	11,829	100 km
2020	BUFFALO	11,050	98 km
2020	RENO	10,830	79 km
2002	LINE CREEK	10,693	98 km
1988	ROCHELLE HILLS 2	8,718	78 km
1994	PETERSON-ELLIOTT	8,321	76 km
1999	ANTELOPE	7,479	89 km
2002	POWNELL	7,460	51 km
2002	HAIRY	7,402	70 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	26°F (-3°C)	0.5 in	Driest
February	26°F (-3°C)	0.6 in
March	33°F (1°C)	0.7 in
April	42°F (6°C)	1.7 in
May	52°F (11°C)	2.7 in
June	62°F (17°C)	2.8 in	Wettest
July	72°F (22°C)	1.5 in	Warmest
August	69°F (20°C)	1.2 in
September	58°F (15°C)	1.3 in
October	46°F (8°C)	1.0 in
November	32°F (0°C)	0.6 in
December	23°F (-5°C)	0.6 in	Coldest

Sleepy Hollow has a seasonal temperature swing of 49°F / from 23°F in December to 72°F in July. Total annual precipitation is 15.0 inches, with June being the wettest month (2.8") and January the driest (0.5").

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