St. Charles, SD
Full City Profile · South Dakota · Gregory County County
5.0
/5.0
A+
Excellent
11
Population
55/sq mi density
48°F
Avg Temperature
A+
Overall
5.0 / 5.0
Strong
A+
Education
5.0 / 5.0
0.0% bachelor's degree or higher
St. Charles experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 21°F in January while summers reach 74°F in July. Annual precipitation totals 25.9 inches. The area receives 37.2 inches of snow annually.
Temperature
21°F Jan (-6°C)
74°F Jul (23°C)
| Annual Average | 47.6°F |
| 12% below US avg | |
| January Average | 21°F (-6°C) |
| July Average | 74°F (23°C) |
Geography
| Elevation | 2,075 ft (632 m) |
| Area | 0.2 sq mi (0.5 km²) |
| Population Density | 55/sq mi |
| Coordinates | 43.0881°N, 99.0949°W |
| Timezone | America/Chicago |
| County | Gregory County County |
| Nearest Airport | Ainsworth Regional (ANW) 58 miles away |
Precipitation & Snow
Air Quality
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 16.2 / 100 |
| Social Vulnerability | 18.9 / 100 |
| Community Resilience | 78.3 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Earthquake | Very Low |
| Wildfire | Relatively Low |
| Flood | Very Low |
| Hail | Relatively Low |
| Strong Wind | Very 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)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 21°F (-6°C) | 0.4 in | Coldest |
| February | 25°F (-4°C) | 0.7 in | |
| March | 35°F (2°C) | 1.4 in | |
| April | 46°F (8°C) | 3.1 in | |
| May | 57°F (14°C) | 4.3 in | Wettest |
| June | 68°F (20°C) | 3.9 in | |
| July | 74°F (23°C) | 3.2 in | Warmest |
| August | 72°F (22°C) | 2.8 in | |
| September | 64°F (18°C) | 2.9 in | |
| October | 50°F (10°C) | 2.0 in | |
| November | 36°F (2°C) | 0.9 in | |
| December | 24°F (-4°C) | 0.3 in | Driest |
St. Charles has a seasonal temperature swing of 53°F / from 21°F in January to 74°F in July. Total annual precipitation is 25.9 inches, with May being the wettest month (4.3") and December the driest (0.3").