Castlewood, SD
Full City Profile · South Dakota · Hamlin County County
4.3
/5.0
A
Great
756
Population
657/sq mi density
$87,768
Median Income
$33,313 per capita
$178,600
Home Value
$442,758 Zillow
$1,028
Median Rent
37.1% income on rent
43°F
Avg Temperature
A
Overall
4.3 / 5.0
Strong
A+
Economy
4.7 / 5.0
$87,768 median income, 2.1% unemployment
A+
Affordability
5.0 / 5.0
$178,600 home value, $1,028/mo rent
B
Education
3.1 / 5.0
25.7% bachelor's degree or higher
Castlewood has a cool climate with an average annual temperature of 43°F (6°C). Winters average 12°F in January while summers reach 71°F in July. Annual precipitation totals 24.3 inches. The area receives 41.1 inches of snow annually.
Temperature
12°F Jan (-11°C)
71°F Jul (21°C)
| Annual Average | 42.7°F |
| 21% below US avg | |
| January Average | 12°F (-11°C) |
| July Average | 71°F (21°C) |
Geography
| Elevation | 1,686 ft (514 m) |
| Area | 1.2 sq mi (3.0 km²) |
| Population Density | 657/sq mi |
| Coordinates | 44.7242°N, 97.0309°W |
| Timezone | America/Chicago |
| County | Hamlin County County |
| Nearest Airport | Watertown Regional (ATY) 14 miles away |
Precipitation & Snow
Air Quality
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 10.0 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 64.4 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Very Low |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Low |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 12°F (-11°C) | 0.5 in | Coldest, Driest |
| February | 16°F (-9°C) | 0.6 in | |
| March | 28°F (-2°C) | 1.1 in | |
| April | 42°F (6°C) | 2.1 in | |
| May | 56°F (13°C) | 3.2 in | |
| June | 66°F (19°C) | 4.0 in | Wettest |
| July | 71°F (21°C) | 3.5 in | Warmest |
| August | 68°F (20°C) | 3.1 in | |
| September | 60°F (16°C) | 2.7 in | |
| October | 46°F (8°C) | 2.3 in | |
| November | 31°F (-1°C) | 0.8 in | |
| December | 18°F (-8°C) | 0.5 in |
Castlewood has a seasonal temperature swing of 59°F / from 12°F in January to 71°F in July. Total annual precipitation is 24.3 inches, with June being the wettest month (4.0") and January the driest (0.5").