Brant Lake South, SD
Full City Profile · South Dakota · Minnehaha County County
3.4
/5.0
B
Good
210
Population
396/sq mi density
$105,000
Median Income
$43,460 per capita
46°F
Avg Temperature
B
Overall
3.4 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
5.0 / 5.0
$105,000 median income, 0.0% unemployment
D
Education
1.8 / 5.0
9.8% bachelor's degree or higher
Brant Lake South experiences four distinct seasons with an average annual temperature of 46°F (8°C). Winters average 16°F in January while summers reach 72°F in July. Annual precipitation totals 27.4 inches. The area receives 42.5 inches of snow annually. Air quality is rated Good with a median AQI of 34.
Temperature
16°F Jan (-9°C)
72°F Jul (22°C)
| Annual Average | 45.9°F |
| 15% below US avg | |
| January Average | 16°F (-9°C) |
| July Average | 72°F (22°C) |
Geography
| Elevation | 1,623 ft (495 m) |
| Area | 2.7 sq mi (7.1 km²) |
| Population Density | 396/sq mi |
| Coordinates | 43.9109°N, 96.9408°W |
| Timezone | America/Chicago |
| County | Minnehaha County County |
| Nearest Airport | Joe Foss Field (FSD) 25 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 34.0 |
| Rating | Good |
| Good Days % | 81.4% |
| Unhealthy Days | 2 |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0443 ppm |
| NO₂ (Nitrogen Dioxide) | 8.4 ppb |
| SO₂ (Sulfur Dioxide) | 0.16 ppb |
| CO (Carbon Monoxide) | 0.24 ppm |
| PM2.5 (Fine Particles) | 7.7 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 89.5 / 100 |
| Social Vulnerability | 14.1 / 100 |
| Community Resilience | 86.9 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Earthquake | Very Low |
| Wildfire | Relatively Low |
| Flood | Relatively Moderate |
| Hail | Relatively Moderate |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively High |
| Lightning | Relatively Low |
| Ice Storm | Very High |
| Drought | Relatively Moderate |
| Cold Wave | Relatively High |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 16°F (-9°C) | 0.5 in | Coldest, Driest |
| February | 21°F (-6°C) | 0.9 in | |
| March | 33°F (0°C) | 1.3 in | |
| April | 46°F (8°C) | 2.9 in | |
| May | 58°F (15°C) | 4.0 in | Wettest |
| June | 68°F (20°C) | 3.9 in | |
| July | 72°F (22°C) | 3.2 in | Warmest |
| August | 70°F (21°C) | 3.4 in | |
| September | 63°F (17°C) | 3.1 in | |
| October | 49°F (9°C) | 2.1 in | |
| November | 34°F (1°C) | 1.0 in | |
| December | 21°F (-6°C) | 1.1 in |
Brant Lake South has a seasonal temperature swing of 56°F / from 16°F in January to 72°F in July. Total annual precipitation is 27.4 inches, with May being the wettest month (4.0") and January the driest (0.5").