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Weather & Climate in Spencer, ID
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Spencer has a cool climate with an average annual temperature of 45°F (7°C). Winters average 22°F in January while summers reach 71°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 12.2 inches (drier than the 38-inch national average). The area receives 47.3 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 5,876 feet.
Temperature
22°F Jan (-5°C)
71°F Jul (22°C)
| Annual Average | 45.3°F |
| 16% below US avg | |
| January Average | 22°F (-5°C) |
| July Average | 71°F (22°C) |
| Sunny Days | 311 days/yr |
Geography
| Elevation | 5,876 ft (1,791 m) |
| Area | 1.1 sq mi (2.9 km²) |
| Population Density | 25/sq mi |
| Coordinates | 44.3678°N, 112.1843°W |
| Timezone | America/Boise |
| County | Clark County County |
| Nearest Airport | Idaho Falls Regional (IDA) 59 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 33.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 0.8 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 0.2 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Very Low |
| Wildfire | Relatively Low |
| Flood | Very Low |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Very Low |
| Winter Weather | Very Low |
| Lightning | Very Low |
| Ice Storm | Very Low |
| Drought | Very Low |
| Cold Wave | Very Low |
| Landslide | Very Low |
| Volcano | Very Low |
| Avalanche | Relatively Moderate |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
1,067 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.6.
| Jul 26, 2005 | 16 km N of Dillon, Montana | M5.6 | 116 km | 13 km |
| Aug 20, 1999 | 22 km NW of Lima, Montana | M5.1 | 67 km | 16 km |
| Mar 30, 2014 | 22 km S of Mammoth, Wyoming | M4.8 | 127 km | 6 km |
| Jun 7, 1994 | 18 km E of Challis, Idaho | M4.8 | 145 km | 5 km |
| Apr 9, 2019 | 9 km NE of Lima, Montana | M4.6 | 45 km | 14 km |
| May 4, 1992 | 20 km E of Challis, Idaho | M4.6 | 143 km | 10 km |
| Feb 5, 2006 | 44 km NE of Spencer, Idaho | M4.4 | 44 km | 14 km |
| Apr 5, 2011 | 28 km NNE of Spencer, Idaho | M4.4 | 28 km | 12 km |
| May 6, 1992 | 17 km E of Challis, Idaho | M4.4 | 145 km | 5 km |
| May 8, 2007 | 8 km NNW of Alder, Montana | M4.4 | 114 km | 14 km |
| Jun 16, 2017 | 12 km E of Hebgen Lake Estates, Montana | M4.4 | 102 km | 9 km |
| Jun 13, 2016 | 45 km W of Hebgen Lake Estates, Montana | M4.3 | 52 km | 10 km |
| Aug 21, 2003 | 53 km N of Kelly, Wyoming | M4.3 | 136 km | 6 km |
| Oct 28, 1998 | 18 km S of Whitehall, Montana | M4.3 | 148 km | 5 km |
| Nov 24, 2000 | 24 km S of Mammoth, Wyoming | M4.2 | 126 km | 9 km |
| Jul 14, 2023 | 3 km S of Lima, Montana | M4.2 | 42 km | 12 km |
| Aug 23, 1998 | 9 km N of Alta, Wyoming | M4.2 | 110 km | 5 km |
| Aug 30, 1997 | 25 km WNW of Hebgen Lake Estates, Montana | M4.1 | 76 km | 4 km |
| Jun 7, 1994 | 21 km E of Challis, Idaho | M4.1 | 143 km | 5 km |
| Oct 7, 2024 | 11 km E of Dillon, Montana | M4.1 | 98 km | 17 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
47 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 1 injury.
| Date | Rating | Distance | Path | Fatalities |
| Apr 7, 1978 | EF2 | 97 km | 1.5 mi | 0 |
| Sep 26, 1959 | EF2 | 57 km | 1.0 mi | 0 |
| Jun 1, 2002 | EF1 | 74 km | 2.5 mi | 0 |
| May 31, 1997 | EF1 | 65 km | 4.0 mi | 0 |
| Jun 2, 1992 | EF1 | 78 km | 0.5 mi | 0 |
| Jun 4, 1991 | EF1 | 88 km | 0.2 mi | 0 |
| Mar 25, 1991 | EF1 | 22 km | 1.0 mi | 0 |
| Apr 17, 1988 | EF1 | 88 km | 0.5 mi | 0 |
| Apr 17, 1988 | EF1 | 80 km | 2.0 mi | 0 |
| Mar 23, 1988 | EF1 | 71 km | 15.0 mi | 0 |
| Apr 11, 1985 | EF1 | 53 km | 0.1 mi | 0 |
| May 15, 1984 | EF1 | 71 km | 8.0 mi | 0 |
| Apr 21, 1981 | EF1 | 79 km | 1.1 mi | 0 |
| Jul 8, 1980 | EF1 | 86 km | 0.1 mi | 0 |
| Jul 27, 1972 | EF1 | 89 km | 1.0 mi | 0 |
| Aug 25, 1955 | EF1 | 64 km | 0.5 mi | 0 |
| Aug 6, 2023 | EF0 | 39 km | 1.6 mi | 0 |
| May 31, 2018 | EF0 | 82 km | 3.0 mi | 0 |
| Nov 17, 2017 | EF0 | 94 km | 5.0 mi | 0 |
| Jul 11, 2015 | EF0 | 59 km | 7.4 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Nearby Volcanoes
4 volcanoes within 200 km. Closest: Hell's Half Acre (99 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Hell's Half Acre | Shield | 1,631 m (5,351 ft) | -3250 | 99 km |
| Yellowstone | Caldera(s) | 2,805 m (9,203 ft) | -1350 | 121 km |
| Craters of the Moon | Pyroclastic cone(s) | 2,005 m (6,578 ft) | -130 | 149 km |
| Wapi Lava Field | Shield | 1,604 m (5,262 ft) | -300 | 185 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: JEFFERSON (108,542 acres, 2010).
| Year | Name | Acres Burned | Distance |
| 2010 | JEFFERSON | 108,542 | 83 km |
| 2019 | SHEEP | 107,233 | 93 km |
| 2018 | GRASSY RIDGE | 106,164 | 29 km |
| 2011 | T17 | 45,631 | 83 km |
| 1999 | INEEL FIRE | 43,547 | 83 km |
| 2003 | DEEP | 38,701 | 27 km |
| 2017 | DEER PARK | 17,745 | 58 km |
| 2006 | CLARKS CANYON | 14,848 | 88 km |
| 2018 | INDIAN BUTTE | 12,897 | 12 km |
| 2006 | SNOWSHOE | 11,910 | 31 km |
| 2003 | WINSLOW | 11,794 | 31 km |
| 2003 | MENAN | 11,790 | 57 km |
| 2000 | BEAVER CREEK | 9,568 | 95 km |
| 1994 | ROBINSON | 8,629 | 95 km |
| 1988 | SWEETWATER | 8,405 | 78 km |
| 1994 | UNNAMED | 8,385 | 40 km |
| 2021 | GOOSE | 7,817 | 61 km |
| 2000 | CAMAS | 7,249 | 43 km |
| 2018 | MONUMENT | 6,973 | 77 km |
| 1986 | CEDAR BT 2 | 6,488 | 30 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 22°F (-5°C) | 1.1 in | |
| February | 19°F (-7°C) | 0.9 in | |
| March | 25°F (-4°C) | 0.9 in | |
| April | 34°F (1°C) | 1.0 in | |
| May | 43°F (6°C) | 1.8 in | Wettest |
| June | 51°F (10°C) | 1.7 in | |
| July | 71°F (22°C) | 0.9 in | Warmest, Driest |
| August | 58°F (15°C) | 0.9 in | |
| September | 51°F (10°C) | 1.0 in | |
| October | 40°F (5°C) | 0.9 in | |
| November | 27°F (-3°C) | 1.0 in | |
| December | 18°F (-8°C) | 1.1 in | Coldest |
Spencer has a seasonal temperature swing of 53°F / from 18°F in December to 71°F in July. Total annual precipitation is 13.1 inches, with May being the wettest month (1.8") and July the driest (0.9").