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Weather & Climate in Eureka, SD
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Eureka has a cool climate with an average annual temperature of 42°F (5°C). Winters average 11°F in January while summers reach 70°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 20.3 inches (drier than the 38-inch national average). The area receives 44.3 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 1,885 feet.
Temperature
11°F Jan (-12°C)
70°F Jul (21°C)
| Annual Average | 41.8°F |
| 23% below US avg | |
| January Average | 11°F (-12°C) |
| July Average | 70°F (21°C) |
| Sunny Days | 276 days/yr |
Geography
| Elevation | 1,885 ft (575 m) |
| Area | 1.0 sq mi (2.6 km²) |
| Population Density | 1,017/sq mi |
| Coordinates | 45.7712°N, 99.6207°W |
| Timezone | America/Chicago |
| County | McPherson County County |
| Nearest Airport | Aberdeen Regional (ABR) 62 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 35.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 11.1 / 100 |
| Social Vulnerability | 82.8 / 100 |
| Community Resilience | 55.2 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Very Low |
| Wildfire | Relatively 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 Low |
| Drought | Relatively Low |
| Cold Wave | Relatively Moderate |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
2 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.7.
| May 30, 2024 | 38 km NNW of Pierre, South Dakota | M3.7 | 141 km | 15 km |
| Aug 15, 2017 | 8 km E of Agar, South Dakota | M3.0 | 107 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
299 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 3 fatalities, 26 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 22, 2010 | EF4 | 37 km | 5.7 mi | 0 |
| Jun 23, 2002 | EF4 | 93 km | 9.0 mi | 0 |
| Aug 24, 2006 | EF3 | 12 km | 14.0 mi | 0 |
| Jun 23, 2002 | EF3 | 78 km | 10.0 mi | 0 |
| May 31, 1996 | EF3 | 95 km | 32.0 mi | 0 |
| Jun 21, 1983 | EF3 | 54 km | 6.0 mi | 0 |
| Aug 19, 1974 | EF3 | 60 km | 0.1 mi | 0 |
| Jun 20, 1968 | EF3 | 44 km | 0.1 mi | 0 |
| Jun 20, 1968 | EF3 | 54 km | 8.8 mi | 0 |
| Jul 31, 1966 | EF3 | 28 km | 26.4 mi | 2 |
| May 20, 1965 | EF3 | 90 km | 3.8 mi | 0 |
| Jun 9, 1957 | EF3 | 91 km | 1.0 mi | 0 |
| Jul 1, 1955 | EF3 | 86 km | 1.3 mi | 0 |
| Aug 28, 2024 | EF2 | 49 km | 5.4 mi | 0 |
| Jul 4, 2020 | EF2 | 65 km | 2.7 mi | 0 |
| Jul 10, 2011 | EF2 | 71 km | 12.0 mi | 0 |
| May 22, 2010 | EF2 | 54 km | 18.6 mi | 0 |
| Jul 18, 2001 | EF2 | 58 km | 1.0 mi | 0 |
| Aug 15, 1999 | EF2 | 94 km | 15.0 mi | 0 |
| Jul 27, 1999 | EF2 | 88 km | 2.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
18 wildfires (100+ acres) recorded within 100 km. Largest: UNNAMED (14,487 acres, 1991).
| Year | Name | Acres Burned | Distance |
| 1991 | UNNAMED | 14,487 | 88 km |
| 2000 | TRIBLE | 9,718 | 73 km |
| 2015 | CANNON BALL | 3,068 | 99 km |
| 2022 | ROHRBACH | 2,887 | 50 km |
| 2006 | 1804 | 2,778 | 60 km |
| 2011 | MOUND CITY | 2,755 | 44 km |
| 2004 | FISCHER | 2,578 | 97 km |
| 2012 | CORNSTALK | 2,561 | 97 km |
| 2006 | FOUR BEAR | 2,179 | 95 km |
| 2000 | FTMANUEL | 2,124 | 68 km |
| 2024 | STATELINE | 2,123 | 96 km |
| 2003 | 24 | 2,119 | 89 km |
| 2015 | BIG LAKE FIRE | 1,587 | 97 km |
| 2003 | JOEL BERTSCH 2 | 1,460 | 19 km |
| 1991 | UNNAMED | 1,438 | 66 km |
| 2004 | ALLEN STUECKLE | 1,330 | 11 km |
| 1992 | UNNAMED | 1,143 | 99 km |
| 2021 | FUZZY | 1,075 | 99 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 11°F (-12°C) | 0.4 in | Coldest, Driest |
| February | 17°F (-8°C) | 0.4 in | |
| March | 29°F (-2°C) | 0.9 in | |
| April | 44°F (7°C) | 1.8 in | |
| May | 56°F (14°C) | 2.6 in | |
| June | 65°F (19°C) | 3.3 in | Wettest |
| July | 70°F (21°C) | 2.6 in | Warmest |
| August | 70°F (21°C) | 2.2 in | |
| September | 59°F (15°C) | 1.5 in | |
| October | 46°F (8°C) | 1.4 in | |
| November | 28°F (-2°C) | 0.7 in | |
| December | 15°F (-10°C) | 0.4 in |
Eureka has a seasonal temperature swing of 59°F / from 11°F in January to 70°F in July. Total annual precipitation is 18.0 inches, with June being the wettest month (3.3") and January the driest (0.4").