Weather & Climate in Rock River, WY

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

Rock River has a cool climate with an average annual temperature of 42°F (6°C). Winters average 21°F in January while summers reach 67°F in July. The area gets 316 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 11.2 inches (drier than the 38-inch national average). The area receives 51.7 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 6,843 feet.

Temperature

21°F Jan (-6°C) 67°F Jul (19°C)

Annual Average	42.2°F
	22% below US avg
January Average	21°F (-6°C)
July Average	67°F (19°C)
Sunny Days	316 days/yr

Geography

Elevation	6,843 ft (2,086 m)
Area	2.3 sq mi (6.0 km²)
Population Density	109/sq mi
Coordinates	41.7317°N, 105.9751°W
Timezone	America/Denver
County	Albany County County
Nearest Airport	Laramie Regional (LAR) 33 miles away

Precipitation & Snow

Annual Rainfall 11.2"

71% below US avg

Snowfall 51.7"

Wettest Month (May) 1.54"

Driest Month (Feb) 0.47"

Air Quality

AQI Median	34.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively Low
Risk Score	48.5 / 100
Social Vulnerability	21.1 / 100
Community Resilience	74.7 / 100

Hazard Breakdown

Tornado	Relatively Low
Earthquake	Relatively Low
Wildfire	Relatively Low
Flood	Relatively Low
Hail	Relatively Low
Strong Wind	Relatively Low
Heat Wave	No Rating
Winter Weather	Relatively High
Lightning	Relatively High
Ice Storm	Relatively Low
Drought	No Rating
Cold Wave	Relatively Moderate
Landslide	Relatively Moderate
Avalanche	Relatively Moderate

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

Earthquake History

48 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.0.

May 26, 2000	5 km S of Bairoil, Wyoming	M4.0	142 km	5 km
Aug 2, 2021	12 km NW of Rolling Hills, Wyoming	M3.8	141 km	10 km
Mar 19, 2022	5 km NW of Ryan Park, Wyoming	M3.8	65 km	11 km
Aug 29, 2004	16 km NNW of Douglas, Wyoming	M3.8	135 km	5 km
Jun 1, 1993	6 km N of Bairoil, Wyoming	M3.7	147 km	5 km
Jul 23, 1993	29 km WNW of Esterbrook, Wyoming	M3.7	86 km	5 km
Oct 10, 1993	41 km W of Esterbrook, Wyoming	M3.7	77 km	5 km
Jun 2, 2023	9 km SSE of Saratoga, Wyoming	M3.6	77 km	1 km
Aug 6, 1998	18 km NNE of Rawlins, Wyoming	M3.6	104 km	10 km
Aug 13, 2004	35 km SW of Alcova, Wyoming	M3.5	102 km	5 km
Feb 15, 2004	19 km N of Douglas, Wyoming	M3.5	142 km	10 km
Sep 14, 2024	9 km SSE of Saratoga, Wyoming	M3.4	75 km	10 km
Oct 8, 2009	31 km SSW of Alcova, Wyoming	M3.4	98 km	5 km
May 4, 2015	5 km SSW of Encampment, Wyoming	M3.3	94 km	5 km
Jun 3, 2023	8 km SSE of Saratoga, Wyoming	M3.3	77 km	12 km
Aug 26, 2022	27 km E of Bairoil, Wyoming	M3.3	118 km	5 km
Mar 29, 2022	10 km NNW of Ryan Park, Wyoming	M3.3	62 km	5 km
Jan 19, 2022	8 km ESE of Saratoga, Wyoming	M3.3	70 km	5 km
Jul 22, 2020	16 km NW of Rolling Hills, Wyoming	M3.2	140 km	34 km
Jul 3, 2009	22 km SW of Rawlins, Wyoming	M3.2	118 km	5 km

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

Tornado History

91 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 6 injuries.

Date	Rating	Distance	Path	Fatalities
Jun 6, 2018	EF3	38 km	11.3 mi	0
Jun 27, 1955	EF3	81 km	2.0 mi	0
Jun 6, 2018	EF2	47 km	0.6 mi	0
May 27, 2018	EF2	88 km	1.0 mi	0
Jun 7, 2012	EF2	80 km	20.6 mi	0
Jun 5, 1982	EF2	99 km	7.0 mi	0
Jul 2, 1976	EF2	48 km	2.5 mi	0
Jun 6, 2020	EF1	47 km	1.2 mi	0
Jul 6, 2019	EF1	28 km	4.0 mi	0
Jun 12, 2017	EF1	97 km	0.5 mi	0
May 23, 2008	EF1	99 km	2.7 mi	0
Jul 14, 1994	EF1	90 km	1.0 mi	0
May 24, 1990	EF1	97 km	1.0 mi	0
May 24, 1990	EF1	91 km	0.5 mi	0
Sep 18, 1986	EF1	88 km	2.0 mi	0
May 5, 1979	EF1	56 km	0.3 mi	0
Jun 20, 1977	EF1	76 km	0.1 mi	0
Jun 20, 1977	EF1	72 km	0.1 mi	0
Jun 5, 1977	EF1	8 km	0.1 mi	0
Aug 4, 1976	EF1	96 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: MULLEN (179,894 acres, 2020).

Year	Name	Acres Burned	Distance
2020	MULLEN	179,894	74 km
2012	ARAPAHO	100,043	71 km
2016	BEAVER CREEK	44,221	97 km
2018	RYAN	28,858	94 km
2018	BRITANIA MOUNTAIN	23,701	69 km
2019	PEDRO MOUNTAIN	21,904	97 km
2018	BADGER CREEK	20,752	76 km
2002	REESE	19,624	62 km
2002	HENSEL	14,439	81 km
2011	SQUAW MTN	14,379	65 km
2020	RR 316	14,274	51 km
2012	SQUIRREL CREEK	10,768	65 km
2012	COW CAMP	8,567	71 km
2006	TRAILER	8,040	63 km
2012	RUSSELS CAMP	5,811	88 km
2001	LEROY	5,615	73 km
1994	SQUAW MTN.	4,093	65 km
1986	COLLINS PEAK	4,078	65 km
1996	MURPHY RIDGE	4,041	73 km
2004	PENNOCK RX	3,593	62 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	21°F (-6°C)	0.5 in	Coldest
February	26°F (-4°C)	0.5 in	Driest
March	32°F (-0°C)	0.8 in
April	39°F (4°C)	1.2 in
May	48°F (9°C)	1.5 in	Wettest
June	59°F (15°C)	1.5 in
July	67°F (19°C)	1.3 in	Warmest
August	64°F (18°C)	1.0 in
September	55°F (13°C)	1.0 in
October	44°F (6°C)	0.8 in
November	31°F (-1°C)	0.7 in
December	24°F (-5°C)	0.6 in

Rock River has a seasonal temperature swing of 46°F / from 21°F in January to 67°F in July. Total annual precipitation is 11.3 inches, with May being the wettest month (1.5") and February the driest (0.5").

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