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Weather & Climate in Mount Vernon, SD
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Mount Vernon experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 18°F in January while summers reach 76°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 25.8 inches (drier than the 38-inch national average). The area receives 40.6 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 35. The city sits at an elevation of 1,406 feet.
Temperature
18°F Jan (-8°C)
76°F Jul (25°C)
| Annual Average | 47.9°F |
| 11% below US avg | |
| January Average | 18°F (-8°C) |
| July Average | 76°F (25°C) |
| Sunny Days | 291 days/yr |
Geography
| Elevation | 1,406 ft (429 m) |
| Area | 0.4 sq mi (0.9 km²) |
| Population Density | 1,285/sq mi |
| Coordinates | 43.7127°N, 98.2612°W |
| Timezone | America/Chicago |
| County | Davison County County |
| Nearest Airport | Mitchell Municipal (MHE) 12 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 35.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 39.3 / 100 |
| Social Vulnerability | 29.1 / 100 |
| Community Resilience | 81.7 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Earthquake | Very Low |
| Wildfire | Relatively Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Very Low |
| Winter Weather | Relatively High |
| Lightning | Relatively Low |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Moderate |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
12 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.3.
| Nov 3, 2002 | 16 km SSW of Butte, Nebraska | M4.3 | 117 km | 5 km |
| Jun 4, 2021 | 10 km NE of Anoka, Nebraska | M3.7 | 87 km | 5 km |
| Oct 25, 1990 | 8 km N of Plankinton, South Dakota | M3.6 | 19 km | 5 km |
| Feb 6, 1996 | 1 km N of Wausa, Nebraska | M3.6 | 146 km | 5 km |
| Jun 4, 2021 | 9 km ENE of Anoka, Nebraska | M3.1 | 88 km | 5 km |
| Jul 26, 2002 | 0 km WSW of Huron, South Dakota | M3.1 | 72 km | 5 km |
| Jan 4, 2021 | 5 km N of Tyndall, South Dakota | M3.1 | 81 km | 5 km |
| Feb 7, 2014 | 11 km NE of Bijou Hills, South Dakota | M3.0 | 66 km | 5 km |
| Jul 3, 1995 | 9 km SSW of Fort Thompson, South Dakota | M2.8 | 104 km | 5 km |
| Apr 27, 2025 | 9 km NE of Burke, South Dakota | M2.5 | 93 km | 5 km |
| Jan 16, 2022 | 9 km NE of Plankinton, South Dakota | M2.5 | 12 km | 5 km |
| Mar 6, 2024 | 6 km SSE of Santee, Nebraska | M2.5 | 109 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
463 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 7 fatalities, 230 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 18, 2014 | EF4 | 38 km | 11.5 mi | 0 |
| Jun 24, 2003 | EF4 | 74 km | 10.0 mi | 0 |
| May 30, 1998 | EF4 | 47 km | 14.0 mi | 6 |
| Jun 7, 1993 | EF4 | 81 km | 10.0 mi | 0 |
| May 5, 2007 | EF3 | 13 km | 4.0 mi | 0 |
| Aug 24, 2006 | EF3 | 90 km | 24.5 mi | 0 |
| Jun 24, 2003 | EF3 | 32 km | 6.0 mi | 0 |
| Jun 24, 2003 | EF3 | 75 km | 3.5 mi | 0 |
| Jun 7, 1993 | EF3 | 79 km | 5.0 mi | 0 |
| May 7, 1993 | EF3 | 78 km | 10.0 mi | 0 |
| Jun 16, 1992 | EF3 | 71 km | 3.0 mi | 0 |
| Jul 24, 1971 | EF3 | 85 km | 2.5 mi | 0 |
| Jul 3, 1971 | EF3 | 99 km | 0.1 mi | 0 |
| Jun 20, 1968 | EF3 | 23 km | 9.9 mi | 0 |
| Jun 26, 1965 | EF3 | 90 km | 35.6 mi | 0 |
| Jun 21, 1965 | EF3 | 93 km | 15.4 mi | 0 |
| May 24, 1965 | EF3 | 66 km | 9.0 mi | 0 |
| Jun 5, 1962 | EF3 | 98 km | 9.5 mi | 0 |
| May 21, 1962 | EF3 | 17 km | 1.0 mi | 0 |
| May 16, 1962 | EF3 | 91 km | 0.1 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
4 wildfires (100+ acres) recorded within 100 km. Largest: HOLIDAY (2,936 acres, 2022).
| Year | Name | Acres Burned | Distance |
| 2022 | HOLIDAY | 2,936 | 97 km |
| 2000 | GANN VALLEY | 2,534 | 75 km |
| 2023 | SDLDR-HFR-FY23-RX-BROKEN ARROW UNITS B-C-D-E-G-H-I | 1,185 | 44 km |
| 2009 | TAHOHPI WUI RX | 1,166 | 75 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 18°F (-8°C) | 0.4 in | Coldest, Driest |
| February | 23°F (-5°C) | 0.6 in | |
| March | 34°F (1°C) | 1.6 in | |
| April | 48°F (9°C) | 2.5 in | |
| May | 60°F (15°C) | 3.3 in | |
| June | 70°F (21°C) | 3.5 in | Wettest |
| July | 76°F (25°C) | 2.8 in | Warmest |
| August | 73°F (23°C) | 2.2 in | |
| September | 63°F (17°C) | 2.1 in | |
| October | 50°F (10°C) | 1.6 in | |
| November | 33°F (1°C) | 1.0 in | |
| December | 21°F (-6°C) | 0.5 in |
Mount Vernon has a seasonal temperature swing of 58°F / from 18°F in January to 76°F in July. Total annual precipitation is 22.1 inches, with June being the wettest month (3.5") and January the driest (0.4").