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Weather & Climate in Firth, ID
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Firth experiences four distinct seasons with an average annual temperature of 47°F (8°C). Winters average 24°F in January while summers reach 71°F in July. The area gets 302 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 12.1 inches (drier than the 38-inch national average). The area receives 14.7 inches of snow annually. Air quality is rated Good with a median AQI of 33. The city sits at an elevation of 4,567 feet.
Temperature
24°F Jan (-4°C)
71°F Jul (22°C)
| Annual Average | 47.2°F |
| 13% below US avg | |
| January Average | 24°F (-4°C) |
| July Average | 71°F (22°C) |
| Sunny Days | 302 days/yr |
Geography
| Elevation | 4,567 ft (1,392 m) |
| Area | 0.5 sq mi (1.4 km²) |
| Population Density | 657/sq mi |
| Coordinates | 43.3058°N, 112.1835°W |
| Timezone | America/Boise |
| County | Bingham County County |
| Nearest Airport | Idaho Falls Regional (IDA) 15 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 33.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 60.2 / 100 |
| Social Vulnerability | 27.1 / 100 |
| Community Resilience | 28.0 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Relatively Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively High |
| Lightning | Relatively Moderate |
| Ice Storm | Very Low |
| Drought | Very Low |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Low |
| Volcano | Very Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
1,290 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.8.
| Feb 3, 1994 | 4 km SSE of Auburn, Wyoming | M5.8 | 115 km | 8 km |
| Sep 2, 2017 | 12 km E of Soda Springs, Idaho | M5.3 | 95 km | 10 km |
| Apr 21, 2001 | 29 km WSW of Freedom, Idaho | M5.3 | 77 km | 1 km |
| Jan 7, 2004 | 20 km ESE of Kelly, Wyoming | M5.0 | 148 km | 3 km |
| Sep 10, 2017 | 9 km NNW of Georgetown, Idaho | M5.0 | 104 km | 10 km |
| Aug 27, 2016 | 4 km ENE of Bondurant, Wyoming | M4.8 | 148 km | 12 km |
| Aug 5, 2010 | 19 km E of Kelly, Wyoming | M4.8 | 148 km | 5 km |
| Feb 11, 1994 | 3 km SSE of Auburn, Wyoming | M4.8 | 114 km | 5 km |
| Sep 11, 2017 | 9 km NW of Georgetown, Idaho | M4.7 | 104 km | 8 km |
| Sep 3, 2017 | 10 km E of Soda Springs, Idaho | M4.7 | 94 km | 8 km |
| Sep 3, 2017 | 15 km ESE of Soda Springs, Idaho | M4.7 | 99 km | 10 km |
| Sep 10, 2017 | 12 km ESE of Soda Springs, Idaho | M4.7 | 97 km | 5 km |
| Feb 4, 1994 | 4 km WNW of Fairview, Wyoming | M4.7 | 115 km | 5 km |
| Sep 6, 2017 | 11 km NNW of Georgetown, Idaho | M4.6 | 101 km | 10 km |
| Sep 4, 2017 | 13 km ESE of Soda Springs, Idaho | M4.5 | 97 km | 6 km |
| Feb 7, 1994 | 4 km SW of Fairview, Wyoming | M4.5 | 119 km | 5 km |
| Feb 10, 1994 | 3 km WSW of Auburn, Wyoming | M4.4 | 109 km | 5 km |
| Nov 10, 1992 | 32 km WNW of Freedom, Idaho | M4.4 | 66 km | 10 km |
| Feb 3, 1994 | 0 km NNE of Auburn, Wyoming | M4.4 | 111 km | 5 km |
| Jan 26, 2018 | 5 km NNW of Georgetown, Idaho | M4.4 | 108 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
87 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 5 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Aug 17, 1990 | EF2 | 79 km | 4.0 mi | 0 |
| Apr 7, 1978 | EF2 | 25 km | 1.5 mi | 0 |
| Sep 26, 1959 | EF2 | 70 km | 1.0 mi | 0 |
| May 31, 2018 | EF1 | 50 km | 12.0 mi | 0 |
| Jun 1, 2002 | EF1 | 44 km | 2.5 mi | 0 |
| Feb 14, 2000 | EF1 | 36 km | 14.0 mi | 0 |
| Feb 14, 2000 | EF1 | 7 km | 12.0 mi | 0 |
| Feb 14, 2000 | EF1 | 3 km | 9.0 mi | 0 |
| Jul 20, 1999 | EF1 | 59 km | 2.5 mi | 0 |
| May 31, 1997 | EF1 | 64 km | 4.0 mi | 0 |
| Jun 11, 1993 | EF1 | 78 km | 10.0 mi | 0 |
| Jun 2, 1992 | EF1 | 43 km | 0.5 mi | 0 |
| Jun 4, 1991 | EF1 | 49 km | 0.2 mi | 0 |
| Mar 25, 1991 | EF1 | 96 km | 1.0 mi | 0 |
| Apr 17, 1988 | EF1 | 49 km | 0.5 mi | 0 |
| Apr 17, 1988 | EF1 | 39 km | 2.0 mi | 0 |
| Mar 23, 1988 | EF1 | 47 km | 15.0 mi | 0 |
| Aug 24, 1986 | EF1 | 90 km | 0.5 mi | 0 |
| Apr 11, 1985 | EF1 | 70 km | 0.1 mi | 0 |
| May 15, 1984 | EF1 | 68 km | 8.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Nearby Volcanoes
5 volcanoes within 200 km. Closest: Hell's Half Acre (31 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Hell's Half Acre | Shield | 1,631 m (5,351 ft) | -3250 | 31 km |
| Wapi Lava Field | Shield | 1,604 m (5,262 ft) | -300 | 97 km |
| Craters of the Moon | Pyroclastic cone(s) | 2,005 m (6,578 ft) | -130 | 107 km |
| Yellowstone | Caldera(s) | 2,805 m (9,203 ft) | -1350 | 174 km |
| Black Butte Crater Lava Field | Shield | 1,478 m (4,849 ft) | -8400 | 176 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: COXS WELL (219,424 acres, 1996).
| Year | Name | Acres Burned | Distance |
| 1996 | COXS WELL | 219,424 | 75 km |
| 2006 | CRYSTAL | 218,581 | 82 km |
| 1999 | MULE BUTTE | 138,102 | 93 km |
| 2010 | JEFFERSON | 108,542 | 52 km |
| 2019 | SHEEP | 107,233 | 56 km |
| 2018 | GRASSY RIDGE | 106,164 | 94 km |
| 2000 | COFFEE POINT | 73,480 | 54 km |
| 2000 | FLATTOP | 56,792 | 81 km |
| 2017 | POWERLINE | 54,378 | 76 km |
| 2016 | HENRYS CREEK | 52,988 | 37 km |
| 1999 | CEDAR BUTTE | 49,625 | 49 km |
| 2011 | T17 | 45,631 | 63 km |
| 1999 | INEEL FIRE | 43,547 | 55 km |
| 2000 | COFFEE POINT NORTH | 35,980 | 77 km |
| 1992 | SAGEHEN | 26,663 | 25 km |
| 2017 | WILDHORSE | 25,861 | 73 km |
| 1998 | TILDEN 2 | 23,183 | 31 km |
| 1999 | GRANDVIEW | 23,031 | 72 km |
| 2017 | LAVA FLOW | 22,217 | 55 km |
| 2012 | CEDAR BUTTE WSA | 20,564 | 49 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 24°F (-4°C) | 1.0 in | |
| February | 27°F (-3°C) | 0.9 in | |
| March | 36°F (2°C) | 0.9 in | |
| April | 44°F (7°C) | 1.0 in | |
| May | 53°F (12°C) | 1.3 in | Wettest |
| June | 61°F (16°C) | 1.2 in | |
| July | 71°F (22°C) | 0.7 in | Warmest |
| August | 67°F (19°C) | 0.6 in | Driest |
| September | 57°F (14°C) | 0.9 in | |
| October | 46°F (8°C) | 0.9 in | |
| November | 33°F (1°C) | 1.1 in | |
| December | 23°F (-5°C) | 1.0 in | Coldest |
Firth has a seasonal temperature swing of 48°F / from 23°F in December to 71°F in July. Total annual precipitation is 11.5 inches, with May being the wettest month (1.3") and August the driest (0.6").