Weather & Climate in Ennis, MT

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

Ennis has a cool climate with an average annual temperature of 43°F (6°C). Winters average 25°F in January while summers reach 64°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 13.0 inches (drier than the 38-inch national average). The area receives 44.7 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 26 / among the cleanest air in the country. The city sits at an elevation of 4,955 feet.

Temperature

25°F Jan (-4°C) 64°F Jul (18°C)

Annual Average	42.7°F
	21% below US avg
January Average	25°F (-4°C)
July Average	64°F (18°C)
Sunny Days	311 days/yr

Geography

Elevation	4,955 ft (1,510 m)
Area	0.7 sq mi (1.9 km²)
Population Density	831/sq mi
Coordinates	45.3461°N, 111.7313°W
Timezone	America/Denver
County	Madison County County
Nearest Airport	Bozeman Yellowstone International (BZN) 41 miles away

Precipitation & Snow

Annual Rainfall 13.0"

66% below US avg

Snowfall 44.7"

Wettest Month (May) 2.52"

Driest Month (Feb) 0.51"

Air Quality

AQI Median	26.0
Rating	Good

Natural Hazard Risk

Overall Risk	Very Low
Risk Score	41.0 / 100
Social Vulnerability	18.5 / 100
Community Resilience	40.9 / 100

Hazard Breakdown

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

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

Earthquake History

1,098 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.6.

Jul 26, 2005	16 km N of Dillon, Montana	M5.6	69 km	13 km
Aug 20, 1999	22 km NW of Lima, Montana	M5.1	104 km	16 km
Mar 30, 2014	22 km S of Mammoth, Wyoming	M4.8	104 km	6 km
Apr 9, 2019	9 km NE of Lima, Montana	M4.6	95 km	14 km
May 8, 2007	8 km NNW of Alder, Montana	M4.4	32 km	14 km
Apr 5, 2011	28 km NNE of Spencer, Idaho	M4.4	86 km	12 km
Feb 5, 2006	44 km NE of Spencer, Idaho	M4.4	74 km	14 km
Jun 16, 2017	12 km E of Hebgen Lake Estates, Montana	M4.4	83 km	9 km
Jun 13, 2016	45 km W of Hebgen Lake Estates, Montana	M4.3	69 km	10 km
Oct 28, 1998	18 km S of Whitehall, Montana	M4.3	50 km	5 km
Nov 24, 2000	24 km S of Mammoth, Wyoming	M4.2	105 km	9 km
Aug 16, 2019	4 km NW of Manhattan, Montana	M4.2	67 km	2 km
Jul 14, 2023	3 km S of Lima, Montana	M4.2	107 km	12 km
Aug 6, 2019	3 km NW of Manhattan, Montana	M4.1	66 km	5 km
Apr 8, 2000	8 km ENE of Townsend, Montana	M4.1	114 km	5 km
Oct 7, 2024	11 km E of Dillon, Montana	M4.1	61 km	17 km
Aug 30, 1997	25 km WNW of Hebgen Lake Estates, Montana	M4.1	59 km	4 km
Jun 18, 2006	6 km S of Pony, Montana	M4.1	31 km	12 km
Sep 3, 2016	16 km S of Whitehall, Montana	M4.0	52 km	8 km
Mar 6, 2009	18 km S of Whitehall, Montana	M4.0	50 km	12 km

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

Tornado History

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

Date	Rating	Distance	Path	Fatalities
May 19, 1962	EF2	76 km	2.0 mi	0
May 29, 1965	EF1	95 km	0.1 mi	0
Jun 15, 1960	EF1	65 km	1.3 mi	0
Aug 6, 2023	EF0	92 km	1.6 mi	0
Jul 10, 2016	EF0	73 km	0.0 mi	0
Jun 29, 1999	EF0	12 km	0.2 mi	0
Jul 19, 1997	EF0	89 km	0.1 mi	0
Jul 2, 1997	EF0	67 km	0.1 mi	0
Jul 2, 1997	EF0	67 km	0.1 mi	0
May 17, 1994	EF0	69 km	0.1 mi	0
Jul 6, 1993	EF0	75 km	0.1 mi	0
Jun 29, 1992	EF0	13 km	0.1 mi	0
Aug 2, 1959	EF0	98 km	0.1 mi	0

Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Nearby Volcanoes

1 volcano within 200 km. Closest: Yellowstone (132 km).

Name	Type	Elevation	Last Eruption	Distance
Yellowstone	Caldera(s)	2,805 m (9,203 ft)	-1350	132 km

Source: Smithsonian Institution Global Volcanism Program (GVP).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: MAPLE (103,193 acres, 2016).

Year	Name	Acres Burned	Distance
2016	MAPLE	103,193	90 km
2001	FRIDLEY	27,575	72 km
2021	HAYSTACK	26,118	98 km
2007	WH COMPLEX (WICKED CREEK)	22,195	98 km
1988	FAN	20,422	71 km
2012	BEAR TRAP 2	14,875	33 km
2006	CLARKS CANYON	14,848	85 km
2006	BIG CREEK	13,424	68 km
2013	MINER PARADISE COMPLEX	12,210	73 km
2003	WINSLOW	11,794	88 km
2012	MILLIE	10,497	53 km
2000	BEAVER CREEK	9,568	57 km
2015	EUSTIS	8,469	80 km
1988	SWEETWATER	8,405	59 km
2020	BRIDGER FOOTHILLS	8,291	77 km
2015	COTTONWOOD GULCH	8,100	73 km
2021	GOOSE	7,817	70 km
2012	PINE CREEK	7,707	97 km
1991	THOMPSON CREEK	6,974	94 km
2018	MONUMENT	6,973	38 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	25°F (-4°C)	0.6 in
February	27°F (-3°C)	0.5 in	Driest
March	33°F (0°C)	1.1 in
April	41°F (5°C)	1.5 in
May	50°F (10°C)	2.5 in	Wettest
June	58°F (15°C)	2.5 in
July	64°F (18°C)	1.5 in	Warmest
August	64°F (18°C)	1.4 in
September	55°F (13°C)	1.4 in
October	44°F (7°C)	1.1 in
November	31°F (-0°C)	0.8 in
December	24°F (-5°C)	0.6 in	Coldest

Ennis has a seasonal temperature swing of 41°F / from 24°F in December to 64°F in July. Total annual precipitation is 15.5 inches, with May being the wettest month (2.5") and February the driest (0.5").

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