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Weather & Climate in Avon, MT
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Avon has a cool climate with an average annual temperature of 41°F (5°C). Winters average 22°F in January while summers reach 63°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 18.8 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 5,261 feet.
Temperature
22°F Jan (-6°C)
63°F Jul (17°C)
| Annual Average | 41.0°F |
| 24% below US avg | |
| January Average | 22°F (-6°C) |
| July Average | 63°F (17°C) |
| Sunny Days | 273 days/yr |
Geography
| Elevation | 5,261 ft (1,604 m) |
| Area | 13.4 sq mi (34.6 km²) |
| Population Density | 11/sq mi |
| Coordinates | 46.6287°N, 112.5756°W |
| Timezone | America/Denver |
| County | Powell County County |
| Nearest Airport | Helena Regional (HLN) 28 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 26.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 10.0 / 100 |
| Social Vulnerability | 58.1 / 100 |
| Community Resilience | 19.4 / 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 | Very Low |
| Cold Wave | Relatively Low |
| Landslide | Relatively Moderate |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
513 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 | 28 km | 12 km |
| Jul 26, 2005 | 16 km N of Dillon, Montana | M5.6 | 141 km | 13 km |
| Jul 6, 2017 | 15 km S of Lincoln, Montana | M5.0 | 22 km | 15 km |
| Jul 6, 2017 | 14 km SE of Lincoln, Montana | M4.4 | 26 km | 10 km |
| May 8, 2007 | 8 km NNW of Alder, Montana | M4.4 | 142 km | 14 km |
| Jan 30, 2016 | 19 km E of Lincoln, Montana | M4.3 | 37 km | 2 km |
| Oct 28, 1998 | 18 km S of Whitehall, Montana | M4.3 | 109 km | 5 km |
| Aug 16, 2019 | 4 km NW of Manhattan, Montana | M4.2 | 124 km | 2 km |
| Apr 8, 2000 | 8 km ENE of Townsend, Montana | M4.1 | 95 km | 5 km |
| Jun 18, 2006 | 6 km S of Pony, Montana | M4.1 | 125 km | 12 km |
| Aug 6, 2019 | 3 km NW of Manhattan, Montana | M4.1 | 125 km | 5 km |
| Sep 3, 2016 | 16 km S of Whitehall, Montana | M4.0 | 106 km | 8 km |
| Mar 6, 2009 | 18 km S of Whitehall, Montana | M4.0 | 109 km | 12 km |
| Jun 28, 2000 | 21 km SE of Clinton, Montana | M4.0 | 73 km | 10 km |
| Nov 10, 2000 | 14 km NE of Townsend, Montana | M4.0 | 96 km | 2 km |
| Jan 18, 2006 | 18 km NNE of Dillon, Montana | M4.0 | 141 km | 9 km |
| Jul 17, 2017 | 12 km ESE of Lincoln, Montana | M4.0 | 29 km | 13 km |
| Jul 19, 2002 | 43 km NE of Seeley Lake, Montana | M4.0 | 96 km | 25 km |
| Jul 27, 2005 | 18 km N of Dillon, Montana | M4.0 | 139 km | 5 km |
| Jul 6, 2017 | 14 km SSE of Lincoln, Montana | M4.0 | 23 km | 9 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
13 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2.
| Date | Rating | Distance | Path | Fatalities |
| Jul 2, 1966 | EF2 | 99 km | 0.8 mi | 0 |
| Jun 28, 1982 | EF1 | 26 km | 0.5 mi | 0 |
| Sep 15, 1997 | EF0 | 62 km | 0.1 mi | 0 |
| Jun 27, 1997 | EF0 | 42 km | 0.1 mi | 0 |
| Jun 21, 1993 | EF0 | 53 km | 0.1 mi | 0 |
| Jun 11, 1993 | EF0 | 46 km | 0.1 mi | 0 |
| Jul 9, 1992 | EF0 | 26 km | 0.1 mi | 0 |
| Jun 12, 1992 | EF0 | 84 km | 0.1 mi | 0 |
| Aug 11, 1988 | EF0 | 53 km | 2.0 mi | 0 |
| May 4, 1971 | EF0 | 30 km | 0.5 mi | 0 |
| May 17, 1962 | EF0 | 35 km | 0.1 mi | 0 |
| Jul 22, 1960 | EF0 | 44 km | 1.0 mi | 0 |
| Jun 7, 1953 | EF0 | 79 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: RICE RIDGE (171,473 acres, 2017).
| Year | Name | Acres Burned | Distance |
| 2017 | RICE RIDGE | 171,473 | 86 km |
| 1988 | CANYON CREEK | 167,875 | 69 km |
| 2007 | SAWMILL COMPLEX (WYMAN 2) | 68,236 | 86 km |
| 2003 | LINCOLN COMPLEX (SNOWBANK) | 36,987 | 51 km |
| 1988 | CANYON CREEK | 35,865 | 64 km |
| 2017 | LITTLE HOGBACK | 34,646 | 81 km |
| 2021 | HARRIS MTN | 31,792 | 87 km |
| 2017 | ALICE CREEK | 29,971 | 58 km |
| 2012 | ELBOW PASS COMPLEX | 28,989 | 87 km |
| 1984 | NORTH HILL | 27,162 | 56 km |
| 2000 | CANYON FERRY COMPLEX (CAVE GULCH) | 26,997 | 73 km |
| 2021 | HAYSTACK | 26,118 | 59 km |
| 2003 | COONEY RIDGE | 25,741 | 96 km |
| 2007 | CONGER CREEK | 22,936 | 73 km |
| 2000 | MONTURE-SPREAD RIDGE (MONTURE) | 22,493 | 88 km |
| 2007 | MERIWETHER | 18,865 | 63 km |
| 2017 | PARK CREEK | 17,915 | 48 km |
| 2007 | RAILLEY MOUNTAIN | 17,528 | 93 km |
| 2000 | RYAN GULCH | 16,440 | 69 km |
| 2000 | CANYON FERRY COMPLEX (BUCKSNORT) | 14,843 | 66 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 22°F (-6°C) | 1.0 in | |
| February | 24°F (-5°C) | 0.6 in | Driest |
| March | 31°F (-0°C) | 0.8 in | |
| April | 40°F (4°C) | 1.0 in | |
| May | 48°F (9°C) | 2.0 in | Wettest |
| June | 56°F (14°C) | 1.9 in | |
| July | 63°F (17°C) | 1.2 in | Warmest |
| August | 63°F (17°C) | 1.4 in | |
| September | 53°F (12°C) | 1.2 in | |
| October | 43°F (6°C) | 0.8 in | |
| November | 29°F (-2°C) | 0.8 in | |
| December | 21°F (-6°C) | 0.9 in | Coldest |
Avon has a seasonal temperature swing of 42°F / from 21°F in December to 63°F in July. Total annual precipitation is 13.6 inches, with May being the wettest month (2.0") and February the driest (0.6").