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Interior, SD
Full City Profile · South Dakota · Jackson County County
2.5
/5.0
C+
Fair
53
Population
40/sq mi density
$114,300
Home Value
$321,470 Zillow
50°F
Avg Temperature
302 sunny days/yr
C+
Overall
2.5 / 5.0
Fair overall score based on economy, affordability, safety and education
C+
Safety
2.5 / 5.0
0 violent crimes/100K
C
Education
2.5 / 5.0
18.4% bachelor's degree or higher
Interior experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 26°F in January while summers reach 77°F in July. The area gets 302 sunny days per year. Annual precipitation totals 19.6 inches. The area receives 38.0 inches of snow annually. Air quality is rated Good with a median AQI of 35.
Temperature
26°F Jan (-4°C)
77°F Jul (25°C)
| Annual Average | 50.4°F |
| 7% below US avg | |
| January Average | 26°F (-4°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 302 days/yr |
Geography
| Elevation | 2,382 ft (726 m) |
| Area | 1.3 sq mi (3.5 km²) |
| Population Density | 40/sq mi |
| Coordinates | 43.7273°N, 101.9833°W |
| Timezone | America/Chicago |
| County | Jackson County County |
| Nearest Airport | Rapid City Regional (RAP) 58 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 35.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0479 ppm |
| PM2.5 (Fine Particles) | 7.6 μg/m³ |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 10.2 / 100 |
| Social Vulnerability | 99.7 / 100 |
| Community Resilience | 0.4 / 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 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 | 26°F (-4°C) | 0.3 in | Driest |
| February | 28°F (-2°C) | 0.4 in | |
| March | 36°F (2°C) | 1.1 in | |
| April | 47°F (8°C) | 1.8 in | |
| May | 58°F (15°C) | 2.8 in | |
| June | 68°F (20°C) | 3.0 in | Wettest |
| July | 77°F (25°C) | 2.4 in | Warmest |
| August | 74°F (23°C) | 1.6 in | |
| September | 63°F (17°C) | 1.2 in | |
| October | 50°F (10°C) | 1.3 in | |
| November | 34°F (1°C) | 0.6 in | |
| December | 25°F (-4°C) | 0.4 in | Coldest |
Interior has a seasonal temperature swing of 52°F / from 25°F in December to 77°F in July. Total annual precipitation is 16.9 inches, with June being the wettest month (3.0") and January the driest (0.3").