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Weather & Climate in Old Agency, MT
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Old Agency experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 30°F in January while summers reach 69°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 16.7 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 2,519 feet.
Temperature
30°F Jan (-1°C)
69°F Jul (21°C)
| Annual Average | 47.7°F |
| 12% below US avg | |
| January Average | 30°F (-1°C) |
| July Average | 69°F (21°C) |
| Sunny Days | 273 days/yr |
Geography
| Elevation | 2,519 ft (768 m) |
| Area | 0.7 sq mi (1.7 km²) |
| Population Density | 200/sq mi |
| Coordinates | 47.3252°N, 114.2975°W |
| Timezone | America/Denver |
| County | Lake County County |
| Nearest Airport | Missoula Montana (MSO) 30 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 26.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 67.7 / 100 |
| Social Vulnerability | 58.8 / 100 |
| Community Resilience | 51.0 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Relatively Moderate |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively High |
| Lightning | Relatively Low |
| Ice Storm | Relatively Moderate |
| Drought | Very Low |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Moderate |
| Avalanche | Relatively High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
369 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 | 139 km | 12 km |
| Jul 6, 2017 | 15 km S of Lincoln, Montana | M5.0 | 136 km | 15 km |
| Dec 22, 1998 | Idaho-Montana border region | M4.7 | 101 km | 12 km |
| Jul 6, 2017 | 14 km SE of Lincoln, Montana | M4.4 | 142 km | 10 km |
| Jan 30, 2016 | 19 km E of Lincoln, Montana | M4.3 | 148 km | 2 km |
| Jun 29, 1995 | 2 km NNW of Kila, Montana | M4.1 | 91 km | 5 km |
| May 2, 1995 | 2 km NW of Kila, Montana | M4.1 | 92 km | 9 km |
| Aug 17, 1994 | 1 km E of Mullan, Idaho | M4.1 | 113 km | 2 km |
| Apr 15, 1998 | 11 km NE of Swan Lake, Montana | M4.1 | 86 km | 4 km |
| Jan 20, 1998 | 15 km SSE of Happys Inn, Montana | M4.0 | 90 km | 7 km |
| Jul 6, 2017 | 14 km SSE of Lincoln, Montana | M4.0 | 140 km | 9 km |
| Apr 1, 1992 | 10 km ESE of Swan Lake, Montana | M4.0 | 75 km | 5 km |
| Jul 17, 2017 | 12 km ESE of Lincoln, Montana | M4.0 | 141 km | 13 km |
| Jun 28, 2000 | 21 km SE of Clinton, Montana | M4.0 | 97 km | 10 km |
| Jul 19, 2002 | 43 km NE of Seeley Lake, Montana | M4.0 | 95 km | 25 km |
| Oct 19, 2017 | 12 km SE of Lincoln, Montana | M3.9 | 141 km | 4 km |
| Apr 1, 1993 | 15 km E of Lincoln, Montana | M3.9 | 144 km | 5 km |
| Jun 2, 1996 | 37 km N of Ovando, Montana | M3.9 | 94 km | 5 km |
| Apr 17, 2018 | 13 km ESE of Lincoln, Montana | M3.8 | 142 km | 14 km |
| Sep 26, 2004 | 14 km WSW of Pablo, Montana | M3.8 | 27 km | 17 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
10 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF0.
| Date | Rating | Distance | Path | Fatalities |
| May 9, 2023 | EF0 | 19 km | 0.5 mi | 0 |
| Nov 4, 2013 | EF0 | 74 km | 0.8 mi | 0 |
| Sep 1, 2011 | EF0 | 54 km | 0.7 mi | 0 |
| Apr 9, 2008 | EF0 | 100 km | 0.0 mi | 0 |
| Jul 18, 2007 | EF0 | 37 km | 1.0 mi | 0 |
| Jul 18, 2007 | EF0 | 72 km | 8.0 mi | 0 |
| Aug 7, 1995 | EF0 | 55 km | 0.1 mi | 0 |
| Mar 3, 1991 | EF0 | 31 km | 0.1 mi | 0 |
| Jul 20, 1983 | EF0 | 50 km | 2.0 mi | 0 |
| Jul 9, 1978 | EF0 | 90 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 | 82 km |
| 2007 | CHIPPY CREEK | 95,656 | 67 km |
| 2017 | LOLO PEAK | 62,316 | 73 km |
| 2015 | BEAR CREEK | 60,710 | 85 km |
| 2021 | THORNE CREEK | 39,694 | 82 km |
| 2007 | JOCKO LAKES | 35,759 | 50 km |
| 2003 | FISH CREEK COMPLEX (THOMPSON CREEK) | 33,779 | 57 km |
| 2003 | LITTLE SALMON CREEK | 33,044 | 80 km |
| 2012 | FERN | 29,736 | 96 km |
| 2016 | COPPER KING | 28,338 | 69 km |
| 2017 | LIBERTY | 27,731 | 50 km |
| 2003 | BARTLETT MOUNTAIN | 27,614 | 81 km |
| 2017 | SUNRISE | 26,896 | 50 km |
| 2003 | COONEY RIDGE | 25,741 | 81 km |
| 2017 | SHEEP GAP | 24,702 | 59 km |
| 2007 | CONGER CREEK | 22,936 | 99 km |
| 2000 | MONTURE-SPREAD RIDGE (MONTURE) | 22,493 | 83 km |
| 2015 | TRAIL CREEK | 22,338 | 99 km |
| 2022 | ELMO | 22,148 | 61 km |
| 2003 | MINERAL-PRIMM (MINERAL AND PRIMM) | 20,888 | 52 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 30°F (-1°C) | 1.5 in | |
| February | 29°F (-2°C) | 1.0 in | Driest |
| March | 36°F (2°C) | 1.1 in | |
| April | 43°F (6°C) | 1.3 in | |
| May | 51°F (10°C) | 2.2 in | Wettest |
| June | 58°F (15°C) | 2.1 in | |
| July | 69°F (21°C) | 1.2 in | Warmest |
| August | 65°F (18°C) | 1.3 in | |
| September | 55°F (13°C) | 1.3 in | |
| October | 45°F (7°C) | 1.1 in | |
| November | 33°F (0°C) | 1.3 in | |
| December | 25°F (-4°C) | 1.5 in | Coldest |
Old Agency has a seasonal temperature swing of 44°F / from 25°F in December to 69°F in July. Total annual precipitation is 16.9 inches, with May being the wettest month (2.2") and February the driest (1.0").