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Weather & Climate in Bynum, MT

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

Bynum has a cool climate with an average annual temperature of 44°F (6°C). Winters average 25°F in January while summers reach 66°F in July. The area gets 273 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 15.3 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 3,975 feet.

Temperature

25°F Jan (-4°C) 66°F Jul (19°C)
Annual Average43.5°F
19% below US avg
January Average25°F (-4°C)
July Average66°F (19°C)
Sunny Days273 days/yr

Geography

Elevation3,975 ft (1,212 m)
Area1.6 sq mi (4.2 km²)
Population Density7/sq mi
Coordinates47.9681°N, 112.3165°W
TimezoneAmerica/Denver
CountyTeton County County
Nearest AirportCut Bank International (CTB)
44 miles away

Precipitation & Snow

Annual Rainfall 15.3"
60% below US avg
Wettest Month (Jun) 2.28"
Driest Month (Feb) 0.31"

Air Quality

AQI Median26.0
RatingGood

Natural Hazard Risk

Overall RiskVery Low
Risk Score19.0 / 100
Social Vulnerability21.3 / 100
Community Resilience57.6 / 100

Hazard Breakdown

Tornado Very Low
Earthquake Very Low
Wildfire Relatively Low
Flood Very Low
Hail Very Low
Strong Wind Very Low
Heat Wave Very Low
Winter Weather Relatively Moderate
Lightning Very Low
Ice Storm Very Low
Drought Relatively Low
Cold Wave Relatively Moderate
Landslide Very Low
Avalanche Relatively Moderate
Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

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

Jul 6, 2017 11 km SE of Lincoln, Montana M5.8 122 km 12 km
Jul 6, 2017 15 km S of Lincoln, Montana M5.0 131 km 15 km
Jul 6, 2017 14 km SE of Lincoln, Montana M4.4 125 km 10 km
Jan 30, 2016 19 km E of Lincoln, Montana M4.3 114 km 2 km
Apr 15, 1998 11 km NE of Swan Lake, Montana M4.1 107 km 4 km
Jul 17, 2017 12 km ESE of Lincoln, Montana M4.0 121 km 13 km
Jul 19, 2002 43 km NE of Seeley Lake, Montana M4.0 81 km 25 km
Jul 6, 2017 14 km SSE of Lincoln, Montana M4.0 128 km 9 km
Apr 1, 1992 10 km ESE of Swan Lake, Montana M4.0 106 km 5 km
Aug 16, 1994 27 km W of Chester, Montana M3.9 93 km 5 km
Oct 19, 2017 12 km SE of Lincoln, Montana M3.9 122 km 4 km
Apr 1, 1993 15 km E of Lincoln, Montana M3.9 113 km 5 km
Jun 2, 1996 37 km N of Ovando, Montana M3.9 88 km 5 km
Mar 21, 1992 20 km NE of Seeley Lake, Montana M3.8 104 km 5 km
Jul 5, 2024 24 km ENE of Seeley Lake, Montana M3.8 101 km 22 km
Apr 17, 2018 13 km ESE of Lincoln, Montana M3.8 121 km 14 km
Jun 1, 1996 23 km N of Ovando, Montana M3.8 104 km 10 km
May 1, 1997 35 km SSE of Magrath, Canada M3.8 132 km 5 km
May 7, 1992 14 km NE of Seeley Lake, Montana M3.8 109 km 5 km
Jul 2, 1992 4 km SSE of South Browning, Montana M3.8 79 km 10 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

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

Date Rating Distance Path Fatalities
Jul 2, 1966 EF2 52 km 0.8 mi 0
Jun 13, 2006 EF1 78 km 10.0 mi 0
Jul 3, 1998 EF1 72 km 0.5 mi 0
Jun 6, 1994 EF1 74 km 0.1 mi 0
Jul 5, 1988 EF1 87 km 0.2 mi 0
Jul 3, 1978 EF1 94 km 1.0 mi 0
Jul 3, 1978 EF1 94 km 1.0 mi 0
Jul 3, 1978 EF1 94 km 1.0 mi 0
Jun 1, 1977 EF1 64 km 0.1 mi 0
Jun 1, 1977 EF1 74 km 0.1 mi 0
Jul 2, 1964 EF1 47 km 27.0 mi 0
Jun 22, 1962 EF1 51 km 0.1 mi 0
Jun 2, 1999 EF0 97 km 0.1 mi 0
Jun 6, 1994 EF0 73 km 0.1 mi 0
Jun 21, 1993 EF0 91 km 0.1 mi 0
Jun 21, 1993 EF0 69 km 0.1 mi 0
Jun 26, 1992 EF0 82 km 0.1 mi 0
Jun 29, 1986 EF0 14 km 0.2 mi 0
Aug 2, 1981 EF0 71 km 0.1 mi 0
Aug 2, 1981 EF0 71 km 0.1 mi 0
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: CANYON CREEK (167,875 acres, 1988).

Year Name Acres Burned Distance
1988 CANYON CREEK 167,875 87 km
2015 BEAR CREEK 60,710 85 km
2007 FOOL CREEK 53,912 46 km
2015 FAMILY PEAK COMPLEX 49,769 57 km
2007 AHORN 45,633 67 km
1988 GATES PARK 42,493 49 km
2007 SKYLAND 41,237 77 km
2003 LITTLE SALMON CREEK 33,044 85 km
2017 ALICE CREEK 29,971 92 km
2012 ELBOW PASS COMPLEX 28,989 78 km
2003 BARTLETT MOUNTAIN 27,614 90 km
2007 CONGER CREEK 22,936 98 km
2000 MONTURE-SPREAD RIDGE (MONTURE) 22,493 100 km
2015 TRAIL CREEK 22,338 79 km
2017 SCALP 20,309 54 km
2017 STRAWBERRY 17,781 49 km
2021 GREENHOUSE 14,501 82 km
2007 CORPORAL 14,054 77 km
2013 RED SHALE 13,712 51 km
2015 MOOSE RIDGE 11,395 50 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 25°F (-4°C) 0.4 in Coldest
February 31°F (-1°C) 0.3 in Driest
March 36°F (2°C) 0.5 in
April 45°F (7°C) 0.9 in
May 54°F (12°C) 2.2 in
June 62°F (16°C) 2.3 in Wettest
July 66°F (19°C) 1.4 in Warmest
August 66°F (19°C) 1.5 in
September 56°F (13°C) 1.1 in
October 47°F (8°C) 0.6 in
November 34°F (1°C) 0.4 in
December 28°F (-2°C) 0.3 in

Bynum has a seasonal temperature swing of 41°F / from 25°F in January to 66°F in July. Total annual precipitation is 11.6 inches, with June being the wettest month (2.3") and February the driest (0.3").

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