Weather & Climate in Fontenelle, WY

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

Fontenelle has a cool climate with an average annual temperature of 39°F (4°C). Winters average 14°F in January while summers reach 65°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 8.6 inches (drier than the 38-inch national average). The area receives 33.8 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 6,430 feet.

Temperature

14°F Jan (-10°C) 65°F Jul (18°C)

Annual Average	39.1°F
	28% below US avg
January Average	14°F (-10°C)
July Average	65°F (18°C)
Sunny Days	310 days/yr

Geography

Elevation	6,430 ft (1,960 m)
Area	3.5 sq mi (9.0 km²)
Population Density	5/sq mi
Coordinates	42.0033°N, 110.0622°W
Timezone	America/Denver
County	Lincoln County County
Nearest Airport	Southwest Wyoming Regional (RKS) 59 miles away

Precipitation & Snow

Annual Rainfall 8.6"

78% below US avg

Snowfall 33.8"

Wettest Month (May) 1.14"

Driest Month (Jan) 0.31"

Air Quality

AQI Median	34.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively Low
Risk Score	51.9 / 100
Social Vulnerability	29.1 / 100
Community Resilience	15.1 / 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	Relatively High
Lightning	Relatively Moderate
Ice Storm	Very Low
Drought	Very Low
Cold Wave	Very Low
Landslide	Relatively Moderate
Volcano	Very Low
Avalanche	Very High

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

Earthquake History

1,183 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.8.

Feb 3, 1994	4 km SSE of Auburn, Wyoming	M5.8	113 km	8 km
Sep 2, 2017	12 km E of Soda Springs, Idaho	M5.3	135 km	10 km
Apr 21, 2001	29 km WSW of Freedom, Idaho	M5.3	150 km	1 km
Sep 10, 2017	9 km NNW of Georgetown, Idaho	M5.0	128 km	10 km
Apr 15, 2010	9 km NE of Randolph, Utah	M4.9	91 km	10 km
Sep 21, 2013	20 km W of Fort Washakie, Wyoming	M4.8	132 km	76 km
Aug 27, 2016	4 km ENE of Bondurant, Wyoming	M4.8	138 km	12 km
Feb 11, 1994	3 km SSE of Auburn, Wyoming	M4.8	114 km	5 km
Sep 3, 2017	15 km ESE of Soda Springs, Idaho	M4.7	131 km	10 km
Feb 4, 1994	4 km WNW of Fairview, Wyoming	M4.7	112 km	5 km
Sep 10, 2017	12 km ESE of Soda Springs, Idaho	M4.7	134 km	5 km
Sep 3, 2017	10 km E of Soda Springs, Idaho	M4.7	136 km	8 km
Sep 11, 2017	9 km NW of Georgetown, Idaho	M4.7	129 km	8 km
Sep 6, 2017	11 km NNW of Georgetown, Idaho	M4.6	130 km	10 km
Feb 7, 1994	4 km SW of Fairview, Wyoming	M4.5	107 km	5 km
Sep 4, 2017	13 km ESE of Soda Springs, Idaho	M4.5	133 km	6 km
Feb 3, 1994	2 km SW of Auburn, Wyoming	M4.4	117 km	5 km
Feb 3, 1994	13 km WSW of Auburn, Wyoming	M4.4	120 km	5 km
Feb 10, 1994	3 km WSW of Auburn, Wyoming	M4.4	119 km	5 km
Jan 26, 2018	5 km NNW of Georgetown, Idaho	M4.4	124 km	10 km

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

Tornado History

28 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2.

Date	Rating	Distance	Path	Fatalities
May 10, 1950	EF2	96 km	2.0 mi	0
Jul 10, 2001	EF1	26 km	5.0 mi	0
Apr 20, 2001	EF1	68 km	0.2 mi	0
Apr 14, 2000	EF1	68 km	0.5 mi	0
Jul 31, 1978	EF1	87 km	1.0 mi	0
Jul 30, 1975	EF1	98 km	0.1 mi	0
Jun 27, 1974	EF1	71 km	0.1 mi	0
Sep 9, 1973	EF1	63 km	0.1 mi	0
Sep 4, 2024	EF0	72 km	0.1 mi	0
Apr 26, 2019	EF0	62 km	0.1 mi	0
May 28, 2018	EF0	46 km	3.5 mi	0
May 7, 2014	EF0	57 km	0.5 mi	0
Sep 15, 2013	EF0	35 km	0.1 mi	0
Jul 19, 1997	EF0	70 km	3.0 mi	0
Jun 14, 1997	EF0	38 km	0.5 mi	0
Jun 10, 1997	EF0	91 km	0.1 mi	0
May 15, 1992	EF0	88 km	0.1 mi	0
Sep 9, 1991	EF0	34 km	0.5 mi	0
Sep 9, 1991	EF0	21 km	0.4 mi	0
May 2, 1991	EF0	67 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: FONTENELLE (58,125 acres, 2012).

Year	Name	Acres Burned	Distance
2012	FONTENELLE	58,125	70 km
2000	WLD HORSE	41,881	99 km
1999	BRIDGER BA	15,227	79 km
2000	FONTENELLE	14,894	50 km
2018	NORTH EDEN	14,398	83 km
2007	RED CANYON RX BURN-H	13,464	67 km
2010	POLE CREEK STANDS	6,900	54 km
2018	MARTEN CREEK	6,383	93 km
2010	WINDMILL	5,935	97 km
1988	LITTLEBRYN	5,300	95 km
2005	ROCK CREEK RX	4,302	62 km
2002	COMMISARY	3,840	42 km
2010	GIRAFFE CREEK	3,552	98 km
2017	POLE CREEK	3,395	54 km
1988	CORRAL CREEK	3,113	90 km
1988	SIESMIC	2,969	51 km
2007	SWEETWATER	2,942	80 km
1985	BOUNDARY	2,550	82 km
1997	COAL CREEK	2,447	51 km
1998	BOULDERLAK MVD	2,016	61 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	14°F (-10°C)	0.3 in	Coldest, Driest
February	19°F (-7°C)	0.4 in
March	28°F (-2°C)	0.4 in
April	38°F (3°C)	0.7 in
May	47°F (8°C)	1.1 in	Wettest
June	57°F (14°C)	1.0 in
July	65°F (18°C)	0.8 in	Warmest
August	62°F (16°C)	0.8 in
September	52°F (11°C)	0.9 in
October	41°F (5°C)	0.6 in
November	26°F (-4°C)	0.4 in
December	15°F (-9°C)	0.4 in

Fontenelle has a seasonal temperature swing of 51°F / from 14°F in January to 65°F in July. Total annual precipitation is 7.7 inches, with May being the wettest month (1.1") and January the driest (0.3").

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