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Weather & Climate in Frankfort, SD
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Frankfort has a cool climate with an average annual temperature of 44°F (7°C). Winters average 13°F in January while summers reach 72°F in July. The area gets 276 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 22.8 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 1,297 feet.
Temperature
13°F Jan (-11°C)
72°F Jul (22°C)
| Annual Average | 44.0°F |
| 19% below US avg | |
| January Average | 13°F (-11°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 276 days/yr |
Geography
| Elevation | 1,297 ft (395 m) |
| Area | 0.8 sq mi (2.0 km²) |
| Population Density | 180/sq mi |
| Coordinates | 44.8777°N, 98.3092°W |
| Timezone | America/Chicago |
| County | Spink County County |
| Nearest Airport | Huron Regional (HON) 34 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 35.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 17.7 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 61.7 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Earthquake | Very Low |
| Wildfire | Relatively Low |
| Flood | Very Low |
| Hail | Relatively Low |
| Strong Wind | Very Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Moderate |
| Lightning | Very Low |
| Ice Storm | Relatively Low |
| Drought | Relatively Low |
| Cold Wave | Relatively Moderate |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
5 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.6.
| Oct 25, 1990 | 8 km N of Plankinton, South Dakota | M3.6 | 121 km | 5 km |
| Jul 26, 2002 | 0 km WSW of Huron, South Dakota | M3.1 | 58 km | 5 km |
| Aug 15, 2017 | 8 km E of Agar, South Dakota | M3.0 | 130 km | 5 km |
| Jul 3, 1995 | 9 km SSW of Fort Thompson, South Dakota | M2.8 | 136 km | 5 km |
| Jan 16, 2022 | 9 km NE of Plankinton, South Dakota | M2.5 | 124 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
414 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 5 fatalities, 59 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 18, 2014 | EF4 | 94 km | 11.5 mi | 0 |
| Jun 24, 2003 | EF4 | 79 km | 10.0 mi | 0 |
| Jun 23, 2002 | EF4 | 90 km | 9.0 mi | 0 |
| Aug 24, 2006 | EF3 | 62 km | 24.5 mi | 0 |
| Jun 24, 2003 | EF3 | 98 km | 6.0 mi | 0 |
| Jun 24, 2003 | EF3 | 61 km | 3.5 mi | 0 |
| Jun 23, 2002 | EF3 | 98 km | 10.0 mi | 0 |
| May 31, 1996 | EF3 | 67 km | 32.0 mi | 0 |
| Jun 7, 1993 | EF3 | 35 km | 5.0 mi | 0 |
| May 12, 1984 | EF3 | 46 km | 27.0 mi | 0 |
| Jul 18, 1983 | EF3 | 90 km | 0.5 mi | 0 |
| Jul 1, 1973 | EF3 | 44 km | 0.3 mi | 1 |
| Jul 3, 1971 | EF3 | 99 km | 0.1 mi | 0 |
| Jun 25, 1969 | EF3 | 66 km | 1.5 mi | 0 |
| Jun 21, 1961 | EF3 | 66 km | 156.3 mi | 1 |
| Jun 9, 1957 | EF3 | 67 km | 1.0 mi | 0 |
| Aug 30, 2020 | EF2 | 57 km | 1.6 mi | 1 |
| Jul 4, 2020 | EF2 | 96 km | 2.7 mi | 0 |
| Jun 18, 2014 | EF2 | 92 km | 2.2 mi | 0 |
| Jun 18, 2014 | EF2 | 99 km | 0.8 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
6 wildfires (100+ acres) recorded within 100 km. Largest: GANN VALLEY (2,534 acres, 2000).
| Year | Name | Acres Burned | Distance |
| 2000 | GANN VALLEY | 2,534 | 90 km |
| 2004 | TACOMA PARK PLACE | 1,336 | 72 km |
| 2000 | PHEASANT OPENER | 1,206 | 60 km |
| 2005 | N HYDE | 1,204 | 91 km |
| 2009 | TAHOHPI WUI RX | 1,166 | 56 km |
| 1992 | SPRING LK | 1,001 | 99 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 13°F (-11°C) | 0.4 in | Coldest, Driest |
| February | 19°F (-7°C) | 0.6 in | |
| March | 31°F (-1°C) | 1.2 in | |
| April | 46°F (8°C) | 2.0 in | |
| May | 58°F (15°C) | 2.8 in | |
| June | 68°F (20°C) | 3.2 in | Wettest |
| July | 72°F (22°C) | 2.7 in | Warmest |
| August | 71°F (22°C) | 2.3 in | |
| September | 61°F (16°C) | 1.7 in | |
| October | 48°F (9°C) | 1.4 in | |
| November | 30°F (-1°C) | 0.7 in | |
| December | 17°F (-9°C) | 0.4 in |
Frankfort has a seasonal temperature swing of 59°F / from 13°F in January to 72°F in July. Total annual precipitation is 19.4 inches, with June being the wettest month (3.2") and January the driest (0.4").