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Keystone, SD
Full City Profile · South Dakota · Custer County County
3.6
/5.0
B+
Good
404
Population
135/sq mi density
$62,159
Median Income
$33,869 per capita
$188,800
Home Value
$618,725 Zillow
$690
Median Rent
19.3% income on rent
46°F
Avg Temperature
291 sunny days/yr
B+
Overall
3.6 / 5.0
Good overall score based on economy, affordability, safety and education
B
Economy
3.4 / 5.0
$62,159 median income, 6.2% unemployment
A+
Affordability
5.0 / 5.0
$188,800 home value, $690/mo rent
C
Education
2.4 / 5.0
17.4% bachelor's degree or higher
Keystone experiences four distinct seasons with an average annual temperature of 46°F (8°C). Winters average 28°F in January while summers reach 69°F in July. The area gets 291 sunny days per year. Annual precipitation totals 24.1 inches. The area receives 59.3 inches of snow annually. Air quality is rated Good with a median AQI of 35.
Temperature
28°F Jan (-2°C)
69°F Jul (21°C)
| Annual Average | 45.7°F |
| 15% below US avg | |
| January Average | 28°F (-2°C) |
| July Average | 69°F (21°C) |
| Sunny Days | 291 days/yr |
Geography
| Elevation | 4,555 ft (1,388 m) |
| Area | 2.9 sq mi (7.4 km²) |
| Population Density | 135/sq mi |
| Coordinates | 43.8949°N, 103.4268°W |
| Timezone | America/Chicago |
| County | Custer County County |
| Nearest Airport | Rapid City Regional (RAP) 21 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 35.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0488 ppm |
| PM2.5 (Fine Particles) | 4.8 μg/m³ |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 16.4 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 47.0 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Very Low |
| Wildfire | Relatively Moderate |
| Flood | Very Low |
| Hail | Relatively Low |
| Strong Wind | Very Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Very Low |
| Drought | Very Low |
| Cold Wave | Very Low |
| Landslide | Very Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 28°F (-2°C) | 0.5 in | Driest |
| February | 28°F (-2°C) | 0.6 in | |
| March | 33°F (0°C) | 1.0 in | |
| April | 41°F (5°C) | 2.2 in | |
| May | 51°F (11°C) | 3.5 in | Wettest |
| June | 61°F (16°C) | 3.5 in | |
| July | 69°F (21°C) | 2.7 in | Warmest |
| August | 67°F (19°C) | 1.9 in | |
| September | 57°F (14°C) | 1.5 in | |
| October | 46°F (8°C) | 1.2 in | |
| November | 33°F (1°C) | 0.6 in | |
| December | 27°F (-3°C) | 0.6 in | Coldest |
Keystone has a seasonal temperature swing of 42°F / from 27°F in December to 69°F in July. Total annual precipitation is 19.8 inches, with May being the wettest month (3.5") and January the driest (0.5").