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Weather & Climate in Ashton, ID
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Ashton has a cool climate with an average annual temperature of 43°F (6°C). Winters average 21°F in January while summers reach 67°F in July. The area gets 311 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 19.7 inches (drier than the 38-inch national average). The area receives 70.1 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 33. The city sits at an elevation of 5,255 feet.
Temperature
21°F Jan (-6°C)
67°F Jul (19°C)
| Annual Average | 43.4°F |
| 20% below US avg | |
| January Average | 21°F (-6°C) |
| July Average | 67°F (19°C) |
| Sunny Days | 311 days/yr |
Geography
| Elevation | 5,255 ft (1,602 m) |
| Area | 0.6 sq mi (1.7 km²) |
| Population Density | 2,077/sq mi |
| Coordinates | 44.0733°N, 111.4483°W |
| Timezone | America/Boise |
| County | Fremont County County |
| Nearest Airport | Jackson Hole (JAC) 48 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 33.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 38.3 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 17.8 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Relatively Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Moderate |
| Ice Storm | Very Low |
| Drought | Very Low |
| Cold Wave | Relatively Low |
| Landslide | Relatively Low |
| Volcano | Very Low |
| Avalanche | Relatively High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
1,277 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.3.
| Apr 21, 2001 | 29 km WSW of Freedom, Idaho | M5.3 | 128 km | 1 km |
| Aug 20, 1999 | 22 km NW of Lima, Montana | M5.1 | 133 km | 16 km |
| Jan 7, 2004 | 20 km ESE of Kelly, Wyoming | M5.0 | 102 km | 3 km |
| Mar 30, 2014 | 22 km S of Mammoth, Wyoming | M4.8 | 99 km | 6 km |
| Aug 27, 2016 | 4 km ENE of Bondurant, Wyoming | M4.8 | 129 km | 12 km |
| Aug 5, 2010 | 19 km E of Kelly, Wyoming | M4.8 | 100 km | 5 km |
| Dec 28, 1993 | 38 km NE of Bondurant, Wyoming | M4.7 | 124 km | 8 km |
| Apr 9, 2019 | 9 km NE of Lima, Montana | M4.6 | 109 km | 14 km |
| Feb 10, 1994 | 3 km WSW of Auburn, Wyoming | M4.4 | 147 km | 5 km |
| Feb 5, 2006 | 44 km NE of Spencer, Idaho | M4.4 | 76 km | 14 km |
| Feb 3, 1994 | 2 km SW of Auburn, Wyoming | M4.4 | 148 km | 5 km |
| Feb 3, 1994 | 0 km NNE of Auburn, Wyoming | M4.4 | 146 km | 5 km |
| Apr 5, 2011 | 28 km NNE of Spencer, Idaho | M4.4 | 78 km | 12 km |
| Nov 10, 1992 | 32 km WNW of Freedom, Idaho | M4.4 | 109 km | 10 km |
| Jun 20, 1998 | 8 km E of Hoback, Wyoming | M4.4 | 108 km | 0 km |
| Jun 16, 2017 | 12 km E of Hebgen Lake Estates, Montana | M4.4 | 85 km | 9 km |
| Jun 13, 2016 | 45 km W of Hebgen Lake Estates, Montana | M4.3 | 77 km | 10 km |
| Aug 21, 2003 | 53 km N of Kelly, Wyoming | M4.3 | 75 km | 6 km |
| Sep 27, 2001 | 35 km WSW of Dubois, Wyoming | M4.3 | 131 km | 5 km |
| May 11, 2022 | 36 km S of Silver Gate, Montana | M4.2 | 134 km | 14 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
49 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 1 injury.
| Date | Rating | Distance | Path | Fatalities |
| Jul 21, 1987 | EF4 | 92 km | 24.3 mi | 0 |
| Jun 12, 2022 | EF2 | 92 km | 2.1 mi | 0 |
| Apr 7, 1978 | EF2 | 79 km | 1.5 mi | 0 |
| Sep 26, 1959 | EF2 | 41 km | 1.0 mi | 0 |
| Jun 1, 2002 | EF1 | 70 km | 2.5 mi | 0 |
| Feb 14, 2000 | EF1 | 97 km | 12.0 mi | 0 |
| May 31, 1997 | EF1 | 88 km | 4.0 mi | 0 |
| Jun 2, 1992 | EF1 | 64 km | 0.5 mi | 0 |
| Jun 4, 1991 | EF1 | 56 km | 0.2 mi | 0 |
| Mar 25, 1991 | EF1 | 63 km | 1.0 mi | 0 |
| Apr 17, 1988 | EF1 | 56 km | 0.5 mi | 0 |
| Apr 17, 1988 | EF1 | 72 km | 2.0 mi | 0 |
| Mar 23, 1988 | EF1 | 67 km | 15.0 mi | 0 |
| Apr 11, 1985 | EF1 | 45 km | 0.1 mi | 0 |
| May 15, 1984 | EF1 | 36 km | 8.0 mi | 0 |
| Apr 21, 1981 | EF1 | 62 km | 1.1 mi | 0 |
| Jul 8, 1980 | EF1 | 55 km | 0.1 mi | 0 |
| Mar 13, 1959 | EF1 | 91 km | 0.4 mi | 0 |
| Aug 25, 1955 | EF1 | 45 km | 0.5 mi | 0 |
| Jun 2, 2019 | EF0 | 96 km | 1.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Nearby Volcanoes
4 volcanoes within 200 km. Closest: Yellowstone (74 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Yellowstone | Caldera(s) | 2,805 m (9,203 ft) | -1350 | 74 km |
| Hell's Half Acre | Shield | 1,631 m (5,351 ft) | -3250 | 103 km |
| Craters of the Moon | Pyroclastic cone(s) | 2,005 m (6,578 ft) | -130 | 180 km |
| Wapi Lava Field | Shield | 1,604 m (5,262 ft) | -300 | 195 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: NORTH FORK (563,527 acres, 1988).
| Year | Name | Acres Burned | Distance |
| 1988 | NORTH FORK | 563,527 | 89 km |
| 1988 | HUCK | 123,437 | 79 km |
| 2010 | JEFFERSON | 108,542 | 100 km |
| 2018 | GRASSY RIDGE | 106,164 | 45 km |
| 2016 | MAPLE | 103,193 | 82 km |
| 1988 | SNAKE | 95,233 | 84 km |
| 2016 | HENRYS CREEK | 52,988 | 74 km |
| 2003 | DEEP | 38,701 | 90 km |
| 1988 | SHOSHONE | 29,941 | 80 km |
| 1988 | REDSHOSHONE COMPLEX | 27,443 | 81 km |
| 1988 | RED | 21,341 | 75 km |
| 2016 | BERRY | 20,783 | 58 km |
| 2017 | DEER PARK | 17,745 | 53 km |
| 1988 | FALLS | 16,607 | 60 km |
| 2018 | INDIAN BUTTE | 12,897 | 75 km |
| 2006 | SNOWSHOE | 11,910 | 43 km |
| 2003 | WINSLOW | 11,794 | 66 km |
| 2003 | MENAN | 11,790 | 50 km |
| 2009 | ARNICA | 10,738 | 89 km |
| 2000 | BEAVER CREEK | 9,568 | 97 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 21°F (-6°C) | 2.4 in | |
| February | 22°F (-6°C) | 1.8 in | |
| March | 30°F (-1°C) | 1.6 in | |
| April | 39°F (4°C) | 1.5 in | |
| May | 49°F (9°C) | 2.5 in | Wettest |
| June | 57°F (14°C) | 1.8 in | |
| July | 67°F (19°C) | 1.2 in | Warmest, Driest |
| August | 63°F (17°C) | 1.2 in | |
| September | 54°F (12°C) | 1.3 in | |
| October | 43°F (6°C) | 1.5 in | |
| November | 29°F (-2°C) | 2.1 in | |
| December | 19°F (-7°C) | 2.3 in | Coldest |
Ashton has a seasonal temperature swing of 47°F / from 19°F in December to 67°F in July. Total annual precipitation is 21.2 inches, with May being the wettest month (2.5") and July the driest (1.2").