Weather & Climate in Grant, MT

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

Grant has a cool climate with an average annual temperature of 39°F (4°C). Winters average 18°F in January while summers reach 62°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 10.1 inches (drier than the 38-inch national average). 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 5,806 feet.

Temperature

18°F Jan (-8°C) 62°F Jul (17°C)

Annual Average	38.7°F
	28% below US avg
January Average	18°F (-8°C)
July Average	62°F (17°C)
Sunny Days	311 days/yr

Geography

Elevation	5,806 ft (1,770 m)
Area	1.8 sq mi (4.5 km²)
Population Density	22/sq mi
Coordinates	45.0096°N, 113.0675°W
Timezone	America/Denver
County	Beaverhead County County
Nearest Airport	Bozeman Yellowstone International (BZN) 107 miles away

Precipitation & Snow

Annual Rainfall 10.1"

73% below US avg

Wettest Month (Jun) 1.77"

Driest Month (Feb) 0.28"

Air Quality

AQI Median	26.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively Low
Risk Score	42.9 / 100
Social Vulnerability	77.2 / 100
Community Resilience	24.0 / 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	Relatively Low
Cold Wave	Relatively Moderate
Landslide	Relatively Moderate
Volcano	Very Low
Avalanche	Relatively High

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

Earthquake History

738 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	53 km	13 km
Aug 20, 1999	22 km NW of Lima, Montana	M5.1	33 km	16 km
Jan 3, 2015	9 km E of Challis, Idaho	M5.0	100 km	9 km
Apr 13, 2014	15 km NNW of Challis, Idaho	M4.8	109 km	4 km
Jun 7, 1994	18 km E of Challis, Idaho	M4.8	94 km	5 km
Apr 9, 2019	9 km NE of Lima, Montana	M4.6	56 km	14 km
May 4, 1992	20 km E of Challis, Idaho	M4.6	91 km	10 km
Feb 5, 2006	44 km NE of Spencer, Idaho	M4.4	101 km	14 km
Apr 5, 2011	28 km NNE of Spencer, Idaho	M4.4	89 km	12 km
Dec 28, 1991	southern Idaho	M4.4	97 km	5 km
May 6, 1992	17 km E of Challis, Idaho	M4.4	95 km	5 km
Apr 14, 2014	13 km NW of Challis, Idaho	M4.4	110 km	7 km
May 8, 2007	8 km NNW of Alder, Montana	M4.4	85 km	14 km
Jun 13, 2016	45 km W of Hebgen Lake Estates, Montana	M4.3	107 km	10 km
Jan 28, 1995	33 km NNE of Stanley, Idaho	M4.3	147 km	5 km
Jun 8, 2025	24 km E of Clayton, Idaho	M4.3	116 km	7 km
Oct 28, 1998	18 km S of Whitehall, Montana	M4.3	106 km	5 km
Feb 17, 1992	33 km NNE of Stanley, Idaho	M4.3	146 km	5 km
Mar 22, 1992	11 km NE of Challis, Idaho	M4.3	97 km	5 km
Jan 27, 2025	26 km NW of Clayton, Idaho	M4.2	143 km	9 km

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

Tornado History

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

Date	Rating	Distance	Path	Fatalities
Jun 14, 1962	EF2	51 km	0.1 mi	0
May 19, 1962	EF2	43 km	2.0 mi	0
Jul 3, 1988	EF1	49 km	0.2 mi	0
Jun 15, 1987	EF1	68 km	0.1 mi	0
Aug 24, 1984	EF1	44 km	0.1 mi	0
Jun 6, 1976	EF1	47 km	3.0 mi	0
May 29, 1965	EF1	67 km	0.1 mi	0
Jun 1, 1956	EF1	69 km	0.5 mi	0
Aug 6, 2023	EF0	64 km	1.6 mi	0
Aug 20, 2018	EF0	73 km	0.8 mi	0
Jul 10, 2016	EF0	40 km	0.0 mi	0
Jul 19, 1997	EF0	29 km	0.1 mi	0
Sep 5, 1995	EF0	46 km	0.1 mi	0
Jun 15, 1993	EF0	97 km	0.1 mi	0
May 16, 1991	EF0	95 km	0.2 mi	0
Jul 14, 1962	EF0	51 km	0.1 mi	0
Aug 2, 1959	EF0	41 km	0.1 mi	0

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

Nearby Volcanoes

2 volcanoes within 200 km. Closest: Hell's Half Acre (175 km).

Name	Type	Elevation	Last Eruption	Distance
Hell's Half Acre	Shield	1,631 m (5,351 ft)	-3250	175 km
Craters of the Moon	Pyroclastic cone(s)	2,005 m (6,578 ft)	-130	180 km

Source: Smithsonian Institution Global Volcanism Program (GVP).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: MOOSE (142,221 acres, 2022).

Year	Name	Acres Burned	Distance
2022	MOOSE	142,221	92 km
2021	TRAIL CREEK	62,432	88 km
2003	DEEP	38,701	88 km
2021	ALDER CREEK	38,189	88 km
2018	RABBIT FOOT	33,787	93 km
2023	HAYDEN	32,292	59 km
2007	RAT CREEK	25,929	94 km
2011	SALT	22,314	87 km
2020	BEAR CREEK	14,978	29 km
2006	CLARKS CANYON	14,848	27 km
2007	PATTENGAIL CREEK	13,471	78 km
2003	TOBIAS	13,356	55 km
2018	INDIAN BUTTE	12,897	96 km
2018	GOLDSTONE	9,812	36 km
2003	WITHINGTON	9,305	61 km
1988	SWEETWATER	8,405	56 km
2018	MONUMENT	6,973	97 km
1988	LITTLE LOST	6,282	67 km
2013	EUREKA	6,213	95 km
1985	LAKE MOUNTAIN	5,924	81 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	18°F (-8°C)	0.4 in	Coldest
February	23°F (-5°C)	0.3 in	Driest
March	30°F (-1°C)	0.5 in
April	38°F (3°C)	0.8 in
May	46°F (8°C)	1.7 in
June	54°F (12°C)	1.8 in	Wettest
July	62°F (17°C)	1.0 in	Warmest
August	61°F (16°C)	1.1 in
September	53°F (11°C)	1.1 in
October	42°F (6°C)	0.6 in
November	29°F (-2°C)	0.5 in
December	21°F (-6°C)	0.4 in

Grant has a seasonal temperature swing of 44°F / from 18°F in January to 62°F in July. Total annual precipitation is 10.1 inches, with June being the wettest month (1.8") and February the driest (0.3").

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