Weather & Climate in Harrison, MT

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

Harrison experiences four distinct seasons with an average annual temperature of 49°F (10°C). Winters average 31°F in January while summers reach 71°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 18.4 inches (drier than the 38-inch national average). The area receives 51.8 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 4,898 feet.

Temperature

31°F Jan (-0°C) 71°F Jul (22°C)

Annual Average	49.2°F
	9% below US avg
January Average	31°F (-0°C)
July Average	71°F (22°C)
Sunny Days	311 days/yr

Geography

Elevation	4,898 ft (1,493 m)
Area	0.2 sq mi (0.6 km²)
Population Density	533/sq mi
Coordinates	45.7044°N, 111.7844°W
Timezone	America/Denver
County	Madison County County
Nearest Airport	Bozeman Yellowstone International (BZN) 31 miles away

Precipitation & Snow

Annual Rainfall 18.4"

52% below US avg

Snowfall 51.8"

Wettest Month (May) 2.28"

Driest Month (Feb) 0.31"

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

1,059 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	144 km	12 km
Jul 26, 2005	16 km N of Dillon, Montana	M5.6	75 km	13 km
Aug 20, 1999	22 km NW of Lima, Montana	M5.1	129 km	16 km
Jul 6, 2017	15 km S of Lincoln, Montana	M5.0	141 km	15 km
Mar 30, 2014	22 km S of Mammoth, Wyoming	M4.8	135 km	6 km
Apr 9, 2019	9 km NE of Lima, Montana	M4.6	126 km	14 km
Jul 6, 2017	14 km SE of Lincoln, Montana	M4.4	141 km	10 km
Apr 5, 2011	28 km NNE of Spencer, Idaho	M4.4	124 km	12 km
Feb 5, 2006	44 km NE of Spencer, Idaho	M4.4	113 km	14 km
May 8, 2007	8 km NNW of Alder, Montana	M4.4	44 km	14 km
Jun 16, 2017	12 km E of Hebgen Lake Estates, Montana	M4.4	118 km	9 km
Jun 13, 2016	45 km W of Hebgen Lake Estates, Montana	M4.3	108 km	10 km
Jan 30, 2016	19 km E of Lincoln, Montana	M4.3	146 km	2 km
Oct 28, 1998	18 km S of Whitehall, Montana	M4.3	27 km	5 km
Nov 24, 2000	24 km S of Mammoth, Wyoming	M4.2	136 km	9 km
Jul 14, 2023	3 km S of Lima, Montana	M4.2	137 km	12 km
Aug 16, 2019	4 km NW of Manhattan, Montana	M4.2	39 km	2 km
Jun 18, 2006	6 km S of Pony, Montana	M4.1	15 km	12 km
Apr 8, 2000	8 km ENE of Townsend, Montana	M4.1	77 km	5 km
Aug 6, 2019	3 km NW of Manhattan, Montana	M4.1	39 km	5 km

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

Tornado History

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

Date	Rating	Distance	Path	Fatalities
May 19, 1962	EF2	84 km	2.0 mi	0
May 29, 1965	EF1	88 km	0.1 mi	0
Jun 15, 1960	EF1	56 km	1.3 mi	0
Jul 10, 2016	EF0	86 km	0.0 mi	0
Aug 9, 2011	EF0	91 km	0.1 mi	0
Jun 29, 1999	EF0	52 km	0.2 mi	0
Sep 15, 1997	EF0	92 km	0.1 mi	0
Jul 19, 1997	EF0	99 km	0.1 mi	0
Jul 2, 1997	EF0	40 km	0.1 mi	0
Jul 2, 1997	EF0	40 km	0.1 mi	0
Jun 27, 1997	EF0	99 km	0.1 mi	0
Jun 15, 1996	EF0	92 km	2.0 mi	0
May 17, 1994	EF0	34 km	0.1 mi	0
Jun 29, 1992	EF0	28 km	0.1 mi	0
Jun 12, 1992	EF0	70 km	0.1 mi	0

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

Nearby Volcanoes

1 volcano within 200 km. Closest: Yellowstone (167 km).

Name	Type	Elevation	Last Eruption	Distance
Yellowstone	Caldera(s)	2,805 m (9,203 ft)	-1350	167 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	70 km
1988	CANYON CREEK	35,865	82 km
2001	FRIDLEY	27,575	79 km
2021	HAYSTACK	26,118	61 km
2012	BEAR TRAP 2	14,875	18 km
2000	CANYON FERRY COMPLEX (BUCKSNORT)	14,843	97 km
2006	BIG CREEK	13,424	81 km
2013	MINER PARADISE COMPLEX	12,210	89 km
2012	MILLIE	10,497	64 km
2000	BOULDER COMPLEX (HIGH ORE ROAD)	9,625	72 km
2000	BEAVER CREEK	9,568	93 km
2015	EUSTIS	8,469	44 km
1988	SWEETWATER	8,405	85 km
2020	BRIDGER FOOTHILLS	8,291	67 km
2015	COTTONWOOD GULCH	8,100	43 km
2018	MONUMENT	6,973	77 km
2018	BACON RIND	6,380	98 km
2013	EUREKA	6,213	96 km
2001	PURDY CREEK	4,868	52 km
2020	STATE CREEK	4,549	53 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	31°F (-0°C)	0.4 in
February	29°F (-2°C)	0.3 in	Driest
March	35°F (2°C)	0.8 in
April	43°F (6°C)	1.1 in
May	52°F (11°C)	2.3 in	Wettest
June	61°F (16°C)	2.3 in
July	71°F (22°C)	1.3 in	Warmest
August	66°F (19°C)	1.2 in
September	56°F (13°C)	1.3 in
October	46°F (8°C)	0.8 in
November	32°F (0°C)	0.5 in
December	24°F (-4°C)	0.4 in	Coldest

Harrison has a seasonal temperature swing of 47°F / from 24°F in December to 71°F in July. Total annual precipitation is 12.5 inches, with May being the wettest month (2.3") and February the driest (0.3").

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