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St. Onge, SD
Full City Profile · South Dakota · Lawrence County County
3.0
/5.0
B
Good
46
Population
34/sq mi density
48°F
Avg Temperature
311 sunny days/yr
213
Violent Crime/100K
2,828 property/100K
B
Overall
3.0 / 5.0
Good overall score based on economy, affordability, safety and education
F
Safety
1.0 / 5.0
213 violent crimes/100K
A+
Education
5.0 / 5.0
100.0% bachelor's degree or higher
St. Onge experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 25°F in January while summers reach 74°F in July. The area gets 311 sunny days per year. Annual precipitation totals 18.0 inches. The area receives 42.2 inches of snow annually. Air quality is rated Good with a median AQI of 35.
Temperature
25°F Jan (-4°C)
74°F Jul (23°C)
| Annual Average | 47.9°F |
| 11% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 74°F (23°C) |
| Sunny Days | 311 days/yr |
Geography
| Elevation | 3,433 ft (1,046 m) |
| Area | 1.4 sq mi (3.5 km²) |
| Population Density | 34/sq mi |
| Coordinates | 44.5457°N, 103.7199°W |
| Timezone | America/Chicago |
| County | Lawrence County County |
| Nearest Airport | Ellsworth Afb (RCA) 41 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 35.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 49.3 / 100 |
| Social Vulnerability | 35.5 / 100 |
| Community Resilience | 54.0 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Earthquake | Very Low |
| Wildfire | Relatively Moderate |
| Flood | Relatively Low |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Moderate |
| Heat Wave | Very Low |
| Winter Weather | Relatively High |
| Lightning | Relatively Moderate |
| Ice Storm | Very Low |
| Drought | Very Low |
| Cold Wave | Relatively Low |
| Landslide | Relatively Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 25°F (-4°C) | 0.8 in | Coldest, Driest |
| February | 27°F (-3°C) | 0.9 in | |
| March | 35°F (2°C) | 1.7 in | |
| April | 45°F (7°C) | 2.6 in | |
| May | 56°F (13°C) | 3.6 in | |
| June | 65°F (18°C) | 3.7 in | Wettest |
| July | 74°F (23°C) | 2.3 in | Warmest |
| August | 71°F (22°C) | 2.0 in | |
| September | 60°F (16°C) | 1.9 in | |
| October | 48°F (9°C) | 1.7 in | |
| November | 34°F (1°C) | 1.1 in | |
| December | 25°F (-4°C) | 1.0 in |
St. Onge has a seasonal temperature swing of 49°F / from 25°F in January to 74°F in July. Total annual precipitation is 23.4 inches, with June being the wettest month (3.7") and January the driest (0.8").