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Weather & Climate in Edgemont, SD
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Edgemont has a cool climate with an average annual temperature of 44°F (7°C). Winters average 19°F in January while summers reach 72°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 16.1 inches (drier than the 38-inch national average). The area receives 36.2 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 35. The city sits at an elevation of 3,519 feet.
Temperature
19°F Jan (-7°C)
72°F Jul (22°C)
| Annual Average | 44.4°F |
| 18% below US avg | |
| January Average | 19°F (-7°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 302 days/yr |
Geography
| Elevation | 3,519 ft (1,073 m) |
| Area | 1.4 sq mi (3.6 km²) |
| Population Density | 612/sq mi |
| Coordinates | 43.2974°N, 103.8323°W |
| Timezone | America/Chicago |
| County | Fall River County County |
| Nearest Airport | Rapid City Regional (RAP) 65 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 35.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 30.9 / 100 |
| Social Vulnerability | 92.2 / 100 |
| Community Resilience | 74.3 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Earthquake | Very Low |
| Wildfire | Relatively Moderate |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Low |
| Ice Storm | Very Low |
| Drought | Very Low |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
30 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.0.
| Jan 28, 1990 | 8 km N of Manderson-White Horse Creek, South Dakota | M4.0 | 108 km | 5 km |
| Aug 29, 2004 | 16 km NNW of Douglas, Wyoming | M3.8 | 142 km | 5 km |
| Apr 9, 1996 | 34 km SW of Edgemont, South Dakota | M3.7 | 34 km | 5 km |
| Feb 6, 1996 | 13 km WNW of Hill City, South Dakota | M3.7 | 77 km | 5 km |
| Mar 9, 2025 | 7 km W of Fairburn, South Dakota | M3.6 | 60 km | 5 km |
| Feb 15, 2004 | 19 km N of Douglas, Wyoming | M3.5 | 134 km | 10 km |
| Dec 12, 2013 | 10 km WSW of Hermosa, South Dakota | M3.5 | 71 km | 5 km |
| Mar 26, 2021 | 10 km E of Edgemont, South Dakota | M3.4 | 10 km | 5 km |
| Mar 2, 1990 | 7 km N of Manderson-White Horse Creek, South Dakota | M3.2 | 108 km | 5 km |
| Feb 7, 2007 | 11 km WSW of Wasta, South Dakota | M3.1 | 130 km | 5 km |
| May 3, 1996 | 32 km SSW of Edgemont, South Dakota | M3.1 | 32 km | 5 km |
| Jun 18, 1998 | 23 km S of Chadron, Nebraska | M3.1 | 101 km | 5 km |
| Jun 29, 2024 | 22 km ESE of Hill View Heights, Wyoming | M3.0 | 52 km | 10 km |
| Jan 16, 2012 | 25 km E of Buffalo Gap, South Dakota | M3.0 | 71 km | 5 km |
| Nov 2, 1992 | 5 km ESE of Lusk, Wyoming | M3.0 | 77 km | 5 km |
| Jan 6, 2018 | 7 km SW of Guernsey, Wyoming | M3.0 | 144 km | 5 km |
| Jun 30, 1993 | 25 km N of Douglas, Wyoming | M3.0 | 130 km | 5 km |
| Mar 10, 2011 | 22 km N of Van Tassell, Wyoming | M2.9 | 53 km | 5 km |
| Jun 16, 2024 | 7 km NNE of Buffalo Gap, South Dakota | M2.9 | 54 km | 8 km |
| Apr 4, 2024 | 19 km SW of Interior, South Dakota | M2.8 | 139 km | 9 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
175 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 1 fatality, 74 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 13, 2016 | EF2 | 79 km | 7.4 mi | 0 |
| Jun 22, 2012 | EF2 | 22 km | 16.7 mi | 0 |
| Jun 4, 1999 | EF2 | 86 km | 4.0 mi | 0 |
| Jun 4, 1999 | EF2 | 84 km | 15.0 mi | 1 |
| Jun 13, 1984 | EF2 | 76 km | 4.0 mi | 0 |
| Aug 17, 1983 | EF2 | 63 km | 0.2 mi | 0 |
| Jun 19, 1983 | EF2 | 52 km | 22.0 mi | 0 |
| Jun 5, 1982 | EF2 | 73 km | 1.0 mi | 0 |
| Jun 5, 1982 | EF2 | 19 km | 7.0 mi | 0 |
| Jul 28, 1978 | EF2 | 74 km | 5.0 mi | 0 |
| Jul 28, 1976 | EF2 | 56 km | 0.3 mi | 0 |
| Jul 14, 1969 | EF2 | 38 km | 0.1 mi | 0 |
| Jun 20, 1968 | EF2 | 99 km | 13.1 mi | 0 |
| Jun 18, 1967 | EF2 | 100 km | 1.0 mi | 0 |
| Jul 23, 1966 | EF2 | 80 km | 3.8 mi | 0 |
| Jun 22, 1966 | EF2 | 65 km | 0.1 mi | 0 |
| Jun 11, 1965 | EF2 | 63 km | 0.1 mi | 0 |
| Jul 2, 1964 | EF2 | 83 km | 0.1 mi | 0 |
| Jun 22, 1961 | EF2 | 30 km | 0.1 mi | 0 |
| Jun 27, 1960 | EF2 | 85 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: JASPER (82,298 acres, 2000).
| Year | Name | Acres Burned | Distance |
| 2000 | JASPER | 82,298 | 58 km |
| 2012 | WELLNITZ | 77,277 | 100 km |
| 2012 | OIL CREEK | 63,182 | 86 km |
| 2012 | WEST ASH | 55,228 | 87 km |
| 2017 | LEGION LAKE | 54,868 | 54 km |
| 1989 | FT.ROBINSON | 46,887 | 72 km |
| 2006 | SIOUX COUNTY COMPLEX | 39,567 | 62 km |
| 2012 | DOUTHIT | 29,036 | 60 km |
| 2006 | DAWES COUNTY COMPLEX | 27,923 | 91 km |
| 2007 | STAMPEDE | 22,848 | 98 km |
| 1985 | FLINT HILLS | 21,062 | 15 km |
| 2016 | FREEMAN | 19,121 | 71 km |
| 1985 | 4TH OFJULY | 18,177 | 98 km |
| 2003 | RED POINT | 18,057 | 41 km |
| 2012 | HAY CANYON | 17,815 | 68 km |
| 1988 | GALENA | 16,936 | 64 km |
| 2002 | BATTLE CREEK | 15,034 | 79 km |
| 1990 | SWEDLUND | 14,673 | 51 km |
| 2016 | INDIAN CANYON | 13,791 | 7 km |
| 2001 | ELK MOUNTAIN 2 | 13,758 | 53 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 19°F (-7°C) | 0.4 in | Coldest, Driest |
| February | 28°F (-2°C) | 0.5 in | |
| March | 36°F (2°C) | 0.8 in | |
| April | 46°F (8°C) | 1.7 in | |
| May | 56°F (13°C) | 2.7 in | Wettest |
| June | 66°F (19°C) | 2.6 in | |
| July | 72°F (22°C) | 2.3 in | Warmest |
| August | 72°F (22°C) | 1.6 in | |
| September | 61°F (16°C) | 1.3 in | |
| October | 48°F (9°C) | 1.1 in | |
| November | 33°F (0°C) | 0.5 in | |
| December | 23°F (-5°C) | 0.4 in |
Edgemont has a seasonal temperature swing of 53°F / from 19°F in January to 72°F in July. Total annual precipitation is 15.7 inches, with May being the wettest month (2.7") and January the driest (0.4").