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Weather & Climate in Long Lake, SD
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Long Lake has a cool climate with an average annual temperature of 42°F (6°C). Winters average 12°F in January while summers reach 70°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 19.9 inches (drier than the 38-inch national average). Air quality is rated Good with a median AQI of 35. The city sits at an elevation of 1,956 feet.
Temperature
12°F Jan (-11°C)
70°F Jul (21°C)
| Annual Average | 41.9°F |
| 22% below US avg | |
| January Average | 12°F (-11°C) |
| July Average | 70°F (21°C) |
| Sunny Days | 311 days/yr |
Geography
| Elevation | 1,956 ft (596 m) |
| Area | 0.3 sq mi (0.7 km²) |
| Population Density | 61/sq mi |
| Coordinates | 45.8567°N, 99.2058°W |
| Timezone | America/Chicago |
| County | McPherson County County |
| Nearest Airport | Aberdeen Regional (ABR) 47 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
1 earthquake (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.0.
| Aug 15, 2017 | 8 km E of Agar, South Dakota | M3.0 | 128 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
329 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 5 fatalities, 55 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 22, 2010 | EF4 | 62 km | 5.7 mi | 0 |
| Jun 23, 2002 | EF4 | 63 km | 9.0 mi | 0 |
| Jul 17, 2011 | EF3 | 83 km | 16.2 mi | 0 |
| Aug 24, 2006 | EF3 | 42 km | 14.0 mi | 0 |
| Jun 23, 2002 | EF3 | 48 km | 10.0 mi | 0 |
| May 31, 1996 | EF3 | 71 km | 32.0 mi | 0 |
| Jun 21, 1983 | EF3 | 83 km | 6.0 mi | 0 |
| Aug 19, 1974 | EF3 | 48 km | 0.1 mi | 0 |
| May 20, 1974 | EF3 | 94 km | 17.3 mi | 0 |
| Jul 1, 1973 | EF3 | 87 km | 0.3 mi | 1 |
| Jun 25, 1969 | EF3 | 99 km | 1.5 mi | 0 |
| Jun 20, 1968 | EF3 | 87 km | 8.8 mi | 0 |
| Jun 20, 1968 | EF3 | 75 km | 0.1 mi | 0 |
| Jul 31, 1966 | EF3 | 26 km | 26.4 mi | 2 |
| May 20, 1965 | EF3 | 57 km | 3.8 mi | 0 |
| Jun 21, 1961 | EF3 | 87 km | 156.3 mi | 1 |
| Jun 9, 1957 | EF3 | 92 km | 1.0 mi | 0 |
| Aug 28, 2024 | EF2 | 83 km | 5.4 mi | 0 |
| Jul 4, 2020 | EF2 | 38 km | 2.7 mi | 0 |
| Jul 10, 2011 | EF2 | 76 km | 12.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
9 wildfires (100+ acres) recorded within 100 km. Largest: ROHRBACH (2,887 acres, 2022).
| Year | Name | Acres Burned | Distance |
| 2022 | ROHRBACH | 2,887 | 61 km |
| 2006 | 1804 | 2,778 | 93 km |
| 2011 | MOUND CITY | 2,755 | 77 km |
| 2000 | FTMANUEL | 2,124 | 99 km |
| 2003 | JOEL BERTSCH 2 | 1,460 | 22 km |
| 1991 | UNNAMED | 1,438 | 99 km |
| 2004 | TACOMA PARK PLACE | 1,336 | 82 km |
| 2004 | ALLEN STUECKLE | 1,330 | 35 km |
| 2016 | SLR 2016 RX MICHELL | 1,242 | 78 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 12°F (-11°C) | 0.4 in | Coldest, Driest |
| February | 16°F (-9°C) | 0.4 in | |
| March | 28°F (-2°C) | 1.0 in | |
| April | 43°F (6°C) | 1.9 in | |
| May | 56°F (13°C) | 2.5 in | |
| June | 65°F (18°C) | 3.4 in | Wettest |
| July | 70°F (21°C) | 2.4 in | Warmest |
| August | 69°F (21°C) | 2.1 in | |
| September | 58°F (14°C) | 1.6 in | |
| October | 45°F (7°C) | 1.1 in | |
| November | 28°F (-3°C) | 0.6 in | |
| December | 14°F (-10°C) | 0.4 in |
Long Lake has a seasonal temperature swing of 57°F / from 12°F in January to 70°F in July. Total annual precipitation is 17.9 inches, with June being the wettest month (3.4") and January the driest (0.4").