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Weather & Climate in Garretson, SD
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Garretson has a cool climate with an average annual temperature of 45°F (7°C). Winters average 15°F in January while summers reach 72°F in July. The area gets 291 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 29.6 inches (drier than the 38-inch national average). Air quality is rated Good with a median AQI of 35. The city sits at an elevation of 1,485 feet.
Temperature
15°F Jan (-9°C)
72°F Jul (22°C)
| Annual Average | 45.1°F |
| 16% below US avg | |
| January Average | 15°F (-9°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 291 days/yr |
Geography
| Elevation | 1,485 ft (453 m) |
| Area | 0.0 sq mi (0.1 km²) |
| Population Density | 799/sq mi |
| Coordinates | 43.7148°N, 96.5033°W |
| Timezone | America/Chicago |
| County | Rock County County |
| Nearest Airport | Joe Foss Field (FSD) 15 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 35.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 9.4 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 60.8 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Moderate |
| Lightning | Very Low |
| Ice Storm | Relatively Low |
| Drought | Relatively Low |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
2 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.1.
| Jan 4, 2021 | 5 km N of Tyndall, South Dakota | M3.1 | 133 km | 5 km |
| Mar 6, 2024 | 6 km SSE of Santee, Nebraska | M2.5 | 148 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
601 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 22 fatalities, 445 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 16, 1992 | EF5 | 40 km | 16.0 mi | 1 |
| Jun 13, 1968 | EF5 | 79 km | 9.1 mi | 9 |
| Jun 25, 2010 | EF4 | 54 km | 13.7 mi | 0 |
| May 30, 1998 | EF4 | 95 km | 14.0 mi | 6 |
| Mar 29, 1998 | EF4 | 82 km | 73.5 mi | 1 |
| Jun 7, 1993 | EF4 | 65 km | 10.0 mi | 0 |
| Jun 7, 1993 | EF4 | 34 km | 54.0 mi | 0 |
| Jun 16, 1992 | EF4 | 55 km | 7.0 mi | 0 |
| Jun 7, 1965 | EF4 | 84 km | 7.8 mi | 1 |
| Jul 7, 1955 | EF4 | 89 km | 30.0 mi | 1 |
| Aug 7, 1994 | EF3 | 59 km | 4.5 mi | 0 |
| Jun 7, 1993 | EF3 | 42 km | 6.0 mi | 0 |
| Jun 7, 1993 | EF3 | 63 km | 5.0 mi | 0 |
| Jun 7, 1993 | EF3 | 49 km | 6.0 mi | 0 |
| May 7, 1993 | EF3 | 65 km | 10.0 mi | 0 |
| Jun 16, 1992 | EF3 | 70 km | 12.0 mi | 0 |
| Jun 16, 1992 | EF3 | 89 km | 4.0 mi | 0 |
| Jun 16, 1992 | EF3 | 92 km | 3.0 mi | 0 |
| Jun 16, 1992 | EF3 | 94 km | 16.0 mi | 0 |
| Apr 20, 1985 | EF3 | 38 km | 8.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 15°F (-9°C) | 0.5 in | Coldest, Driest |
| February | 20°F (-7°C) | 0.6 in | |
| March | 32°F (-0°C) | 1.6 in | |
| April | 46°F (8°C) | 2.4 in | |
| May | 58°F (15°C) | 3.1 in | |
| June | 68°F (20°C) | 3.7 in | Wettest |
| July | 72°F (22°C) | 3.0 in | Warmest |
| August | 70°F (21°C) | 3.0 in | |
| September | 60°F (16°C) | 2.8 in | |
| October | 48°F (9°C) | 2.0 in | |
| November | 31°F (-0°C) | 1.2 in | |
| December | 18°F (-8°C) | 0.7 in |
Garretson has a seasonal temperature swing of 56°F / from 15°F in January to 72°F in July. Total annual precipitation is 24.5 inches, with June being the wettest month (3.7") and January the driest (0.5").