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Weather & Climate in Egan, SD
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Egan has a cool climate with an average annual temperature of 43°F (6°C). Winters average 13°F in January while summers reach 71°F in July. The area gets 276 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 28.5 inches (drier than the 38-inch national average). The area receives 40.4 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 35. The city sits at an elevation of 1,530 feet.
Temperature
13°F Jan (-11°C)
71°F Jul (21°C)
| Annual Average | 43.3°F |
| 20% below US avg | |
| January Average | 13°F (-11°C) |
| July Average | 71°F (21°C) |
| Sunny Days | 276 days/yr |
Geography
| Elevation | 1,530 ft (466 m) |
| Area | 1.1 sq mi (2.8 km²) |
| Population Density | 220/sq mi |
| Coordinates | 44.0003°N, 96.6485°W |
| Timezone | America/Chicago |
| County | Moody County County |
| Nearest Airport | Brookings Regional (BKX) 23 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 35.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 26.9 / 100 |
| Social Vulnerability | 40.7 / 100 |
| Community Resilience | 59.6 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Moderate |
| Lightning | Very Low |
| Ice Storm | Relatively High |
| Drought | Relatively Low |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
4 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.6.
| Oct 25, 1990 | 8 km N of Plankinton, South Dakota | M3.6 | 148 km | 5 km |
| Jul 26, 2002 | 0 km WSW of Huron, South Dakota | M3.1 | 132 km | 5 km |
| Jan 4, 2021 | 5 km N of Tyndall, South Dakota | M3.1 | 145 km | 5 km |
| Jan 16, 2022 | 9 km NE of Plankinton, South Dakota | M2.5 | 143 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
572 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 21 fatalities, 468 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 16, 1992 | EF5 | 55 km | 16.0 mi | 1 |
| Jun 13, 1968 | EF5 | 74 km | 9.1 mi | 9 |
| Jun 25, 2010 | EF4 | 84 km | 13.7 mi | 0 |
| Jun 24, 2003 | EF4 | 95 km | 10.0 mi | 0 |
| May 30, 1998 | EF4 | 87 km | 14.0 mi | 6 |
| Mar 29, 1998 | EF4 | 90 km | 73.5 mi | 1 |
| Jun 7, 1993 | EF4 | 38 km | 54.0 mi | 0 |
| Jun 7, 1993 | EF4 | 52 km | 10.0 mi | 0 |
| Jun 16, 1992 | EF4 | 60 km | 7.0 mi | 0 |
| Jul 7, 1955 | EF4 | 64 km | 30.0 mi | 1 |
| May 30, 2022 | EF3 | 90 km | 13.3 mi | 0 |
| Aug 7, 1994 | EF3 | 87 km | 4.5 mi | 0 |
| Jun 7, 1993 | EF3 | 29 km | 6.0 mi | 0 |
| Jun 7, 1993 | EF3 | 26 km | 6.0 mi | 0 |
| Jun 7, 1993 | EF3 | 55 km | 5.0 mi | 0 |
| May 7, 1993 | EF3 | 69 km | 10.0 mi | 0 |
| Jun 16, 1992 | EF3 | 89 km | 16.0 mi | 0 |
| Jun 16, 1992 | EF3 | 57 km | 4.0 mi | 0 |
| Jun 16, 1992 | EF3 | 67 km | 12.0 mi | 0 |
| Jun 16, 1992 | EF3 | 71 km | 3.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 13°F (-11°C) | 0.4 in | Coldest, Driest |
| February | 19°F (-8°C) | 0.5 in | |
| March | 31°F (-1°C) | 1.5 in | |
| April | 45°F (7°C) | 2.4 in | |
| May | 58°F (14°C) | 3.0 in | |
| June | 67°F (19°C) | 3.9 in | Wettest |
| July | 71°F (21°C) | 3.2 in | Warmest |
| August | 69°F (21°C) | 2.9 in | |
| September | 60°F (15°C) | 2.7 in | |
| October | 47°F (8°C) | 1.9 in | |
| November | 30°F (-1°C) | 1.1 in | |
| December | 17°F (-8°C) | 0.6 in |
Egan has a seasonal temperature swing of 58°F / from 13°F in January to 71°F in July. Total annual precipitation is 24.2 inches, with June being the wettest month (3.9") and January the driest (0.4").