All Countries
Weather & Climate in Deerfield Colony, MT
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Deerfield Colony has a cool climate with an average annual temperature of 43°F (6°C). Winters average 22°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 15.8 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 3,463 feet.
Temperature
22°F Jan (-5°C)
66°F Jul (19°C)
| Annual Average | 42.8°F |
| 21% below US avg | |
| January Average | 22°F (-5°C) |
| July Average | 66°F (19°C) |
| Sunny Days | 273 days/yr |
Geography
| Elevation | 3,463 ft (1,056 m) |
| Area | 0.6 sq mi (1.5 km²) |
| Population Density | 35/sq mi |
| Coordinates | 47.2571°N, 109.6769°W |
| Timezone | America/Denver |
| County | Fergus County County |
| Nearest Airport | Great Falls International (GTF) 81 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 26.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 45.1 / 100 |
| Social Vulnerability | 45.2 / 100 |
| Community Resilience | 70.3 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Very Low |
| Wildfire | Relatively Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively High |
| Lightning | Relatively Moderate |
| Ice Storm | Very Low |
| Drought | Relatively Low |
| Cold Wave | Relatively High |
| Landslide | Relatively Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
10 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.7.
| Jan 9, 2003 | 23 km E of Wilsall, Montana | M3.7 | 147 km | 11 km |
| Jul 15, 2006 | Western Montana | M3.0 | 144 km | 10 km |
| Dec 5, 1991 | 15 km WSW of Hays, Montana | M3.0 | 97 km | 10 km |
| Sep 15, 2012 | 23 km SSW of White Sulphur Springs, Montana | M2.9 | 144 km | 8 km |
| Aug 25, 2012 | 28 km S of White Sulphur Springs, Montana | M2.8 | 145 km | 10 km |
| Jul 15, 2006 | 28 km S of White Sulphur Springs, Montana | M2.8 | 144 km | 10 km |
| Nov 4, 2017 | 32 km NE of Wilsall, Montana | M2.7 | 132 km | 4 km |
| Oct 16, 2011 | Eastern Montana | M2.7 | 99 km | 21 km |
| Aug 17, 2012 | 28 km S of White Sulphur Springs, Montana | M2.5 | 145 km | 9 km |
| Jan 8, 2003 | 24 km E of Wilsall, Montana | M2.5 | 147 km | 14 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
63 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 6 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jul 5, 1988 | EF3 | 83 km | 12.0 mi | 0 |
| Jul 5, 1988 | EF3 | 71 km | 10.0 mi | 0 |
| Jul 5, 1988 | EF3 | 53 km | 3.0 mi | 0 |
| Jul 8, 2002 | EF2 | 25 km | 10.0 mi | 0 |
| Aug 14, 1999 | EF2 | 29 km | 5.0 mi | 0 |
| Jun 25, 1996 | EF2 | 18 km | 2.0 mi | 0 |
| Apr 24, 1994 | EF2 | 47 km | 1.0 mi | 0 |
| Apr 24, 1994 | EF2 | 47 km | 1.5 mi | 0 |
| May 28, 1981 | EF2 | 48 km | 1.5 mi | 0 |
| Jun 8, 1976 | EF2 | 32 km | 0.1 mi | 0 |
| Jul 10, 1965 | EF2 | 75 km | 2.0 mi | 0 |
| Jul 20, 1964 | EF2 | 96 km | 2.0 mi | 0 |
| Aug 7, 1962 | EF2 | 96 km | 2.0 mi | 0 |
| Jun 16, 2007 | EF1 | 76 km | 5.3 mi | 0 |
| Apr 22, 2003 | EF1 | 44 km | 2.0 mi | 0 |
| Aug 23, 1998 | EF1 | 25 km | 3.5 mi | 0 |
| Jun 19, 1998 | EF1 | 80 km | 1.0 mi | 0 |
| May 10, 1977 | EF1 | 44 km | 0.1 mi | 0 |
| May 10, 1977 | EF1 | 33 km | 0.1 mi | 0 |
| Jun 3, 1971 | EF1 | 70 km | 2.3 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: TURKEY (25,658 acres, 1990).
| Year | Name | Acres Burned | Distance |
| 1990 | TURKEY | 25,658 | 52 km |
| 2021 | TAYLOR | 21,704 | 27 km |
| 2021 | SOUTH MOCCASIN | 12,727 | 14 km |
| 2009 | MEISSNER | 12,318 | 49 km |
| 1985 | SANDPOINT | 10,439 | 80 km |
| 2021 | BALSINGER | 8,317 | 96 km |
| 2022 | EAGLE CREEK | 6,359 | 99 km |
| 2020 | LOUSE CREEK | 5,237 | 18 km |
| 1991 | BURNETTEPK | 4,644 | 28 km |
| 2020 | YOGO | 4,429 | 74 km |
| 2008 | CHOUTEAU CO COMPLEX | 4,365 | 96 km |
| 1996 | COYOTE | 3,320 | 95 km |
| 2020 | EAGLE ROCK ROAD | 3,129 | 67 km |
| 2012 | ANDERSON | 2,917 | 96 km |
| 2020 | LODE ROAD | 2,736 | 78 km |
| 2001 | TWIN COULE | 2,688 | 74 km |
| 2007 | CHOUTEAU CO ASST | 2,646 | 81 km |
| 2001 | LOST FORK-MONARCH COMPLEX (LOST FORK) | 2,313 | 89 km |
| 2014 | 2 RAINTRAP PASTURE PRESCRIBED FIRE | 2,311 | 96 km |
| 1999 | UNNAMED | 2,161 | 92 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 22°F (-5°C) | 0.7 in | Coldest |
| February | 26°F (-3°C) | 0.4 in | Driest |
| March | 34°F (1°C) | 0.8 in | |
| April | 43°F (6°C) | 1.1 in | |
| May | 53°F (11°C) | 3.0 in | Wettest |
| June | 61°F (16°C) | 2.7 in | |
| July | 66°F (19°C) | 1.7 in | |
| August | 67°F (19°C) | 1.7 in | Warmest |
| September | 57°F (14°C) | 1.4 in | |
| October | 46°F (8°C) | 0.9 in | |
| November | 32°F (-0°C) | 0.5 in | |
| December | 24°F (-5°C) | 0.6 in |
Deerfield Colony has a seasonal temperature swing of 45°F / from 22°F in January to 67°F in August. Total annual precipitation is 15.5 inches, with May being the wettest month (3.0") and February the driest (0.4").