Weather & Climate in Sedan, MT

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

Sedan has a cool climate with an average annual temperature of 42°F (5°C). Winters average 21°F in January while summers reach 66°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 14.9 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 5,690 feet.

Temperature

21°F Jan (-6°C) 66°F Jul (19°C)

Annual Average	41.6°F
	23% below US avg
January Average	21°F (-6°C)
July Average	66°F (19°C)
Sunny Days	311 days/yr

Geography

Elevation	5,690 ft (1,734 m)
Area	61.1 sq mi (158.2 km²)
Population Density	2/sq mi
Coordinates	45.9633°N, 110.8793°W
Timezone	America/Denver
County	Park County County
Nearest Airport	Bozeman Yellowstone International (BZN) 18 miles away

Precipitation & Snow

Annual Rainfall 14.9"

61% below US avg

Wettest Month (May) 3.15"

Driest Month (Feb) 0.87"

Air Quality

AQI Median	26.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively Low
Risk Score	66.3 / 100
Social Vulnerability	29.1 / 100
Community Resilience	82.1 / 100

Hazard Breakdown

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

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

Earthquake History

667 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.8.

Mar 30, 2014	22 km S of Mammoth, Wyoming	M4.8	133 km	6 km
May 8, 2007	8 km NNW of Alder, Montana	M4.4	116 km	14 km
Jun 16, 2017	12 km E of Hebgen Lake Estates, Montana	M4.4	132 km	9 km
Oct 28, 1998	18 km S of Whitehall, Montana	M4.3	101 km	5 km
Nov 24, 2000	24 km S of Mammoth, Wyoming	M4.2	135 km	9 km
Aug 16, 2019	4 km NW of Manhattan, Montana	M4.2	39 km	2 km
Aug 30, 1997	25 km WNW of Hebgen Lake Estates, Montana	M4.1	134 km	4 km
Oct 7, 2024	11 km E of Dillon, Montana	M4.1	150 km	17 km
Aug 6, 2019	3 km NW of Manhattan, Montana	M4.1	38 km	5 km
Jun 18, 2006	6 km S of Pony, Montana	M4.1	89 km	12 km
Apr 8, 2000	8 km ENE of Townsend, Montana	M4.1	59 km	5 km
Sep 3, 2016	16 km S of Whitehall, Montana	M4.0	100 km	8 km
Nov 10, 2000	14 km NE of Townsend, Montana	M4.0	61 km	2 km
Jul 14, 2019	11 km NNE of Manhattan, Montana	M4.0	30 km	6 km
Jul 27, 2005	18 km N of Dillon, Montana	M4.0	149 km	5 km
Nov 6, 1997	4 km WSW of Springhill, Montana	M4.0	23 km	5 km
Jan 18, 2006	18 km NNE of Dillon, Montana	M4.0	143 km	9 km
Mar 6, 2009	18 km S of Whitehall, Montana	M4.0	101 km	12 km
Mar 26, 1994	19 km NE of West Yellowstone, Montana	M3.9	131 km	9 km
Sep 18, 2022	22 km SSW of Mammoth, Wyoming	M3.9	131 km	11 km

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

Tornado History

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

Date	Rating	Distance	Path	Fatalities
Jul 2, 2010	EF2	42 km	2.1 mi	0
Jul 10, 1965	EF2	100 km	2.0 mi	0
Jul 20, 1964	EF2	96 km	2.0 mi	0
Jun 5, 2012	EF1	64 km	2.8 mi	0
Aug 22, 1965	EF1	70 km	1.5 mi	0
Jun 15, 1960	EF1	33 km	1.3 mi	0
Aug 9, 2011	EF0	15 km	0.1 mi	0
Sep 9, 2010	EF0	79 km	0.3 mi	0
Jun 29, 1999	EF0	99 km	0.2 mi	0
Jul 2, 1997	EF0	36 km	0.1 mi	0
Jul 2, 1997	EF0	36 km	0.1 mi	0
Jun 15, 1996	EF0	52 km	2.0 mi	0
May 17, 1994	EF0	50 km	0.1 mi	0
Jun 29, 1992	EF0	92 km	0.1 mi	0
Jun 12, 1992	EF0	66 km	0.1 mi	0
Aug 22, 1978	EF0	80 km	0.1 mi	0
Aug 22, 1978	EF0	69 km	0.1 mi	0
Jun 24, 1978	EF0	97 km	0.1 mi	0
May 20, 1973	EF0	75 km	0.1 mi	0

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

Nearby Volcanoes

1 volcano within 200 km. Closest: Yellowstone (171 km).

Name	Type	Elevation	Last Eruption	Distance
Yellowstone	Caldera(s)	2,805 m (9,203 ft)	-1350	171 km

Source: Smithsonian Institution Global Volcanism Program (GVP).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: DERBY (200,993 acres, 2006).

Year	Name	Acres Burned	Distance
2006	DERBY	200,993	93 km
2000	TOSTON-MAUDLOW	80,383	39 km
2021	WOODS CREEK	55,836	71 km
2003	HOBBLE	38,365	95 km
1988	CANYON CREEK	35,865	88 km
2001	FRIDLEY	27,575	54 km
2000	CANYON FERRY COMPLEX (CAVE GULCH)	26,997	100 km
2006	JUNGLE	23,846	67 km
2007	WH COMPLEX (WICKED CREEK)	22,195	83 km
2021	AMERICAN FORK	20,726	49 km
2012	BEAR TRAP 2	14,875	66 km
2000	CANYON FERRY COMPLEX (BUCKSNORT)	14,843	94 km
2006	BIG CREEK	13,424	66 km
2013	MINER PARADISE COMPLEX	12,210	74 km
2012	MILLIE	10,497	61 km
1985	SANDPOINT	10,439	97 km
1994	BLACK BUTTE	10,231	79 km
2015	EUSTIS	8,469	46 km
2020	BRIDGER FOOTHILLS	8,291	25 km
2015	COTTONWOOD GULCH	8,100	36 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	21°F (-6°C)	1.1 in	Coldest
February	24°F (-4°C)	0.9 in	Driest
March	28°F (-2°C)	1.5 in
April	36°F (2°C)	1.7 in
May	45°F (7°C)	3.2 in	Wettest
June	53°F (12°C)	2.9 in
July	66°F (19°C)	1.6 in	Warmest
August	60°F (16°C)	1.7 in
September	51°F (11°C)	1.9 in
October	41°F (5°C)	1.4 in
November	29°F (-2°C)	1.2 in
December	22°F (-5°C)	1.1 in

Sedan has a seasonal temperature swing of 45°F / from 21°F in January to 66°F in July. Total annual precipitation is 20.1 inches, with May being the wettest month (3.2") and February the driest (0.9").

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