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Weather & Climate in Mammoth, MT

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

Mammoth has a cool climate with an average annual temperature of 44°F (6°C). Winters average 24°F in January while summers reach 65°F in July. The area gets 293 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 9.4 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 6,004 feet.

Temperature

24°F Jan (-4°C) 65°F Jul (19°C)
Annual Average43.5°F
19% below US avg
January Average24°F (-4°C)
July Average65°F (19°C)
Sunny Days293 days/yr

Geography

Elevation6,004 ft (1,830 m)
Area0.4 sq mi (0.9 km²)
Population Density49/sq mi
Coordinates45.6692°N, 112.0177°W
TimezoneAmerica/Denver
CountySilver Bow County County
Nearest AirportBozeman Yellowstone International (BZN)
43 miles away

Precipitation & Snow

Annual Rainfall 9.4"
75% below US avg
Wettest Month (Jun) 2.17"
Driest Month (Feb) 0.39"

Air Quality

AQI Median26.0
RatingGood

Natural Hazard Risk

Overall RiskVery Low
Risk Score38.0 / 100
Social Vulnerability17.0 / 100
Community Resilience62.9 / 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 High
Lightning Relatively Moderate
Ice Storm Very Low
Drought Very Low
Cold Wave Relatively Moderate
Landslide Relatively Moderate
Avalanche Very Low
Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

1,025 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.8.

Jul 6, 2017 11 km SE of Lincoln, Montana M5.8 141 km 12 km
Jul 26, 2005 16 km N of Dillon, Montana M5.6 58 km 13 km
Aug 20, 1999 22 km NW of Lima, Montana M5.1 115 km 16 km
Jul 6, 2017 15 km S of Lincoln, Montana M5.0 137 km 15 km
Mar 30, 2014 22 km S of Mammoth, Wyoming M4.8 144 km 6 km
Apr 9, 2019 9 km NE of Lima, Montana M4.6 115 km 14 km
Jul 6, 2017 14 km SE of Lincoln, Montana M4.4 138 km 10 km
Apr 5, 2011 28 km NNE of Spencer, Idaho M4.4 118 km 12 km
Feb 5, 2006 44 km NE of Spencer, Idaho M4.4 110 km 14 km
May 8, 2007 8 km NNW of Alder, Montana M4.4 32 km 14 km
Jun 16, 2017 12 km E of Hebgen Lake Estates, Montana M4.4 125 km 9 km
Jun 13, 2016 45 km W of Hebgen Lake Estates, Montana M4.3 106 km 10 km
Jan 30, 2016 19 km E of Lincoln, Montana M4.3 145 km 2 km
Oct 28, 1998 18 km S of Whitehall, Montana M4.3 10 km 5 km
Nov 24, 2000 24 km S of Mammoth, Wyoming M4.2 145 km 9 km
Aug 16, 2019 4 km NW of Manhattan, Montana M4.2 56 km 2 km
Jul 14, 2023 3 km S of Lima, Montana M4.2 126 km 12 km
Oct 7, 2024 11 km E of Dillon, Montana M4.1 61 km 17 km
Apr 8, 2000 8 km ENE of Townsend, Montana M4.1 88 km 5 km
Aug 6, 2019 3 km NW of Manhattan, Montana M4.1 56 km 5 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

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

Date Rating Distance Path Fatalities
May 19, 1962 EF2 67 km 2.0 mi 0
Jun 28, 1982 EF1 96 km 0.5 mi 0
May 29, 1965 EF1 69 km 0.1 mi 0
Jun 15, 1960 EF1 74 km 1.3 mi 0
Jul 10, 2016 EF0 70 km 0.0 mi 0
Jun 29, 1999 EF0 55 km 0.2 mi 0
Sep 15, 1997 EF0 79 km 0.1 mi 0
Jul 19, 1997 EF0 82 km 0.1 mi 0
Jul 2, 1997 EF0 58 km 0.1 mi 0
Jul 2, 1997 EF0 58 km 0.1 mi 0
May 17, 1994 EF0 50 km 0.1 mi 0
Jun 29, 1992 EF0 30 km 0.1 mi 0
Jun 12, 1992 EF0 80 km 0.1 mi 0
Aug 2, 1959 EF0 82 km 0.1 mi 0
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Nearby Volcanoes

1 volcano within 200 km. Closest: Yellowstone (174 km).

Name Type Elevation Last Eruption Distance
Yellowstone Caldera(s) 2,805 m (9,203 ft) -1350 174 km
Source: Smithsonian Institution Global Volcanism Program (GVP).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: TOSTON-MAUDLOW (80,383 acres, 2000).

Year Name Acres Burned Distance
2000 TOSTON-MAUDLOW 80,383 84 km
2021 ALDER CREEK 38,189 89 km
1988 CANYON CREEK 35,865 87 km
2001 FRIDLEY 27,575 95 km
2021 HAYSTACK 26,118 57 km
2012 BEAR TRAP 2 14,875 35 km
2006 CLARKS CANYON 14,848 88 km
2007 PATTENGAIL CREEK 13,471 92 km
2006 BIG CREEK 13,424 96 km
2012 MILLIE 10,497 79 km
2000 BOULDER COMPLEX (HIGH ORE ROAD) 9,625 71 km
2000 BEAVER CREEK 9,568 99 km
2015 EUSTIS 8,469 59 km
1988 SWEETWATER 8,405 73 km
2020 BRIDGER FOOTHILLS 8,291 85 km
2015 COTTONWOOD GULCH 8,100 60 km
2018 MONUMENT 6,973 75 km
2013 EUREKA 6,213 92 km
2001 PURDY CREEK 4,868 67 km
2015 BEAR LAKE 4,695 95 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 24°F (-4°C) 0.6 in
February 27°F (-3°C) 0.4 in Driest
March 31°F (-1°C) 0.8 in
April 39°F (4°C) 1.0 in
May 47°F (8°C) 2.1 in
June 55°F (13°C) 2.2 in Wettest
July 65°F (19°C) 1.3 in Warmest
August 61°F (16°C) 1.3 in
September 52°F (11°C) 1.3 in
October 43°F (6°C) 0.8 in
November 31°F (-1°C) 0.6 in
December 24°F (-5°C) 0.6 in Coldest

Mammoth has a seasonal temperature swing of 42°F / from 24°F in December to 65°F in July. Total annual precipitation is 12.6 inches, with June being the wettest month (2.2") and February the driest (0.4").

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