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Marvin, SD
Full City Profile · South Dakota · Grant County County
2.0
/5.0
C
Fair
18
Population
33/sq mi density
$38,750
Median Income
$14,950 per capita
43°F
Avg Temperature
276 sunny days/yr
449
Violent Crime/100K
1,142 property/100K
C
Overall
2.0 / 5.0
Fair overall score based on economy, affordability, safety and education
B
Economy
3.1 / 5.0
$38,750 median income, 0.0% unemployment
F
Safety
1.0 / 5.0
449 violent crimes/100K (18% above avg)
C
Education
2.0 / 5.0
12.5% bachelor's degree or higher
Marvin 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. The area gets 276 sunny days per year. Annual precipitation totals 24.6 inches. The area receives 51.0 inches of snow annually. Air quality is rated Good with a median AQI of 35.
Temperature
12°F Jan (-11°C)
71°F Jul (22°C)
| Annual Average | 43.2°F |
| 20% below US avg | |
| January Average | 12°F (-11°C) |
| July Average | 71°F (22°C) |
| Sunny Days | 276 days/yr |
Geography
| Elevation | 1,659 ft (506 m) |
| Area | 0.6 sq mi (1.4 km²) |
| Population Density | 33/sq mi |
| Coordinates | 45.2605°N, 96.9154°W |
| Timezone | America/Chicago |
| County | Grant County County |
| Nearest Airport | Watertown Regional (ATY) 27 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 35.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 18.9 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 78.9 / 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 Moderate |
| 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 |
| February | 17°F (-8°C) | 0.5 in | |
| March | 29°F (-2°C) | 1.4 in | |
| April | 44°F (7°C) | 2.2 in | |
| May | 57°F (14°C) | 2.8 in | |
| June | 66°F (19°C) | 3.5 in | Wettest |
| July | 71°F (22°C) | 3.2 in | Warmest |
| August | 69°F (21°C) | 2.8 in | |
| September | 59°F (15°C) | 2.1 in | |
| October | 47°F (8°C) | 1.7 in | |
| November | 29°F (-2°C) | 0.9 in | |
| December | 16°F (-9°C) | 0.4 in | Driest |
Marvin has a seasonal temperature swing of 59°F / from 12°F in January to 71°F in July. Total annual precipitation is 21.8 inches, with June being the wettest month (3.5") and December the driest (0.4").