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Weather & Climate in St. Anthony, ID
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
St. Anthony has a cool climate with an average annual temperature of 43°F (6°C). Winters average 20°F in January while summers reach 67°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 14.8 inches (drier than the 38-inch national average). Air quality is rated Good with a median AQI of 33. The city sits at an elevation of 4,961 feet.
Temperature
20°F Jan (-7°C)
67°F Jul (19°C)
| Annual Average | 43.1°F |
| 20% below US avg | |
| January Average | 20°F (-7°C) |
| July Average | 67°F (19°C) |
| Sunny Days | 302 days/yr |
Geography
| Elevation | 4,961 ft (1,512 m) |
| Area | 1.9 sq mi (5.0 km²) |
| Population Density | 1,978/sq mi |
| Coordinates | 43.9661°N, 111.6845°W |
| Timezone | America/Boise |
| County | Madison County County |
| Nearest Airport | Idaho Falls Regional (IDA) 37 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 33.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 58.6 / 100 |
| Social Vulnerability | 25.9 / 100 |
| Community Resilience | 57.8 / 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 Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively High |
| Ice Storm | Very Low |
| Drought | Very Low |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Low |
| Volcano | Very Low |
| Avalanche | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
1,523 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 | 146 km | 8 km |
| Sep 2, 2017 | 12 km E of Soda Springs, Idaho | M5.3 | 148 km | 10 km |
| Apr 21, 2001 | 29 km WSW of Freedom, Idaho | M5.3 | 118 km | 1 km |
| Aug 20, 1999 | 22 km NW of Lima, Montana | M5.1 | 126 km | 16 km |
| Jan 7, 2004 | 20 km ESE of Kelly, Wyoming | M5.0 | 113 km | 3 km |
| Mar 30, 2014 | 22 km S of Mammoth, Wyoming | M4.8 | 120 km | 6 km |
| Aug 5, 2010 | 19 km E of Kelly, Wyoming | M4.8 | 112 km | 5 km |
| Aug 27, 2016 | 4 km ENE of Bondurant, Wyoming | M4.8 | 135 km | 12 km |
| Feb 11, 1994 | 3 km SSE of Auburn, Wyoming | M4.8 | 145 km | 5 km |
| Dec 28, 1993 | 38 km NE of Bondurant, Wyoming | M4.7 | 136 km | 8 km |
| Sep 3, 2017 | 10 km E of Soda Springs, Idaho | M4.7 | 149 km | 8 km |
| Feb 4, 1994 | 4 km WNW of Fairview, Wyoming | M4.7 | 150 km | 5 km |
| Apr 9, 2019 | 9 km NE of Lima, Montana | M4.6 | 104 km | 14 km |
| Feb 5, 2006 | 44 km NE of Spencer, Idaho | M4.4 | 82 km | 14 km |
| Feb 3, 1994 | 0 km NNE of Auburn, Wyoming | M4.4 | 141 km | 5 km |
| Feb 10, 1994 | 3 km WSW of Auburn, Wyoming | M4.4 | 141 km | 5 km |
| Nov 10, 1992 | 32 km WNW of Freedom, Idaho | M4.4 | 100 km | 10 km |
| Apr 5, 2011 | 28 km NNE of Spencer, Idaho | M4.4 | 79 km | 12 km |
| Feb 3, 1994 | 13 km WSW of Auburn, Wyoming | M4.4 | 144 km | 5 km |
| Jun 20, 1998 | 8 km E of Hoback, Wyoming | M4.4 | 111 km | 0 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
53 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 2 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Apr 7, 1978 | EF2 | 59 km | 1.5 mi | 0 |
| Sep 26, 1959 | EF2 | 19 km | 1.0 mi | 0 |
| Jun 1, 2002 | EF1 | 48 km | 2.5 mi | 0 |
| Feb 14, 2000 | EF1 | 86 km | 9.0 mi | 0 |
| Feb 14, 2000 | EF1 | 77 km | 12.0 mi | 0 |
| May 31, 1997 | EF1 | 67 km | 4.0 mi | 0 |
| Jun 2, 1992 | EF1 | 42 km | 0.5 mi | 0 |
| Jun 4, 1991 | EF1 | 38 km | 0.2 mi | 0 |
| Mar 25, 1991 | EF1 | 49 km | 1.0 mi | 0 |
| Apr 17, 1988 | EF1 | 38 km | 0.5 mi | 0 |
| Apr 17, 1988 | EF1 | 50 km | 2.0 mi | 0 |
| Mar 23, 1988 | EF1 | 44 km | 15.0 mi | 0 |
| Apr 11, 1985 | EF1 | 23 km | 0.1 mi | 0 |
| May 15, 1984 | EF1 | 17 km | 8.0 mi | 0 |
| Apr 21, 1981 | EF1 | 41 km | 1.1 mi | 0 |
| Jul 8, 1980 | EF1 | 36 km | 0.1 mi | 0 |
| Jul 27, 1972 | EF1 | 85 km | 1.0 mi | 0 |
| Mar 13, 1959 | EF1 | 71 km | 0.4 mi | 0 |
| Aug 25, 1955 | EF1 | 23 km | 0.5 mi | 0 |
| Aug 6, 2023 | EF0 | 98 km | 1.6 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Nearby Volcanoes
4 volcanoes within 200 km. Closest: Hell's Half Acre (80 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Hell's Half Acre | Shield | 1,631 m (5,351 ft) | -3250 | 80 km |
| Yellowstone | Caldera(s) | 2,805 m (9,203 ft) | -1350 | 96 km |
| Craters of the Moon | Pyroclastic cone(s) | 2,005 m (6,578 ft) | -130 | 158 km |
| Wapi Lava Field | Shield | 1,604 m (5,262 ft) | -300 | 173 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: HUCK (123,437 acres, 1988).
| Year | Name | Acres Burned | Distance |
| 1988 | HUCK | 123,437 | 98 km |
| 2010 | JEFFERSON | 108,542 | 78 km |
| 2019 | SHEEP | 107,233 | 92 km |
| 2018 | GRASSY RIDGE | 106,164 | 32 km |
| 2016 | HENRYS CREEK | 52,988 | 58 km |
| 2011 | T17 | 45,631 | 87 km |
| 1999 | INEEL FIRE | 43,547 | 81 km |
| 2003 | DEEP | 38,701 | 78 km |
| 1998 | TILDEN 2 | 23,183 | 93 km |
| 1988 | RED | 21,341 | 97 km |
| 2016 | BERRY | 20,783 | 77 km |
| 2012 | RIDGE TOP | 17,793 | 96 km |
| 2017 | DEER PARK | 17,745 | 31 km |
| 1988 | FALLS | 16,607 | 82 km |
| 2018 | INDIAN BUTTE | 12,897 | 65 km |
| 2006 | SNOWSHOE | 11,910 | 30 km |
| 2003 | WINSLOW | 11,794 | 69 km |
| 2003 | MENAN | 11,790 | 28 km |
| 2010 | MIDDLE BUTTE | 9,417 | 97 km |
| 2007 | TWIN BUTTES | 9,020 | 94 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 20°F (-7°C) | 1.1 in | Coldest |
| February | 23°F (-5°C) | 0.9 in | |
| March | 33°F (0°C) | 0.9 in | |
| April | 42°F (6°C) | 1.2 in | |
| May | 51°F (11°C) | 1.7 in | |
| June | 59°F (15°C) | 1.8 in | Wettest |
| July | 67°F (19°C) | 0.8 in | Warmest, Driest |
| August | 64°F (18°C) | 0.9 in | |
| September | 55°F (13°C) | 1.1 in | |
| October | 45°F (7°C) | 1.2 in | |
| November | 30°F (-1°C) | 1.3 in | |
| December | 20°F (-7°C) | 1.3 in |
St. Anthony has a seasonal temperature swing of 47°F / from 20°F in January to 67°F in July. Total annual precipitation is 14.1 inches, with June being the wettest month (1.8") and July the driest (0.8").