Weather & Climate in Lyons, SD
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Lyons experiences four distinct seasons with an average annual temperature of 47°F (9°C). Winters average 18°F in January while summers reach 74°F in July. Annual precipitation totals 27.9 inches (drier than the 38-inch national average). The area receives 39.6 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 34. 81% of days have good air quality. The city sits at an elevation of 1,567 feet.
Temperature
18°F Jan (-8°C)
74°F Jul (24°C)
| Annual Average | 47.4°F |
| 12% below US avg | |
| January Average | 18°F (-8°C) |
| July Average | 74°F (24°C) |
Geography
| Elevation | 1,567 ft (478 m) |
| Area | 13.8 sq mi (35.8 km²) |
| Population Density | 188/sq mi |
| Coordinates | 43.7249°N, 96.8662°W |
| Timezone | America/Chicago |
| County | Minnehaha County County |
| Nearest Airport | Joe Foss Field (FSD) 12 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 34.0 |
| Rating | Good |
| Good Days % | 81.4% |
| Unhealthy Days | 2 |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 89.5 / 100 |
| Social Vulnerability | 14.1 / 100 |
| Community Resilience | 86.9 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Earthquake | Very Low |
| Wildfire | Relatively Low |
| Flood | Relatively Moderate |
| Hail | Relatively Moderate |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively High |
| Lightning | Relatively Low |
| Ice Storm | Very High |
| Drought | Relatively Moderate |
| Cold Wave | Relatively High |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
6 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 | 129 km | 5 km |
| Feb 6, 1996 | 1 km N of Wausa, Nebraska | M3.6 | 146 km | 5 km |
| Jul 26, 2002 | 0 km WSW of Huron, South Dakota | M3.1 | 129 km | 5 km |
| Jan 4, 2021 | 5 km N of Tyndall, South Dakota | M3.1 | 111 km | 5 km |
| Jan 16, 2022 | 9 km NE of Plankinton, South Dakota | M2.5 | 123 km | 5 km |
| Mar 6, 2024 | 6 km SSE of Santee, Nebraska | M2.5 | 129 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
622 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 12 fatalities, 320 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 16, 1992 | EF5 | 69 km | 16.0 mi | 1 |
| Jun 25, 2010 | EF4 | 80 km | 13.7 mi | 0 |
| Jun 24, 2003 | EF4 | 95 km | 10.0 mi | 0 |
| May 30, 1998 | EF4 | 65 km | 14.0 mi | 6 |
| Jun 7, 1993 | EF4 | 4 km | 54.0 mi | 0 |
| Jun 7, 1993 | EF4 | 37 km | 10.0 mi | 0 |
| Jun 16, 1992 | EF4 | 81 km | 7.0 mi | 0 |
| Jun 7, 1965 | EF4 | 68 km | 7.8 mi | 1 |
| Jul 7, 1955 | EF4 | 99 km | 30.0 mi | 1 |
| Aug 7, 1994 | EF3 | 87 km | 4.5 mi | 0 |
| Jun 7, 1993 | EF3 | 19 km | 6.0 mi | 0 |
| Jun 7, 1993 | EF3 | 32 km | 6.0 mi | 0 |
| Jun 7, 1993 | EF3 | 34 km | 5.0 mi | 0 |
| May 7, 1993 | EF3 | 38 km | 10.0 mi | 0 |
| Jun 16, 1992 | EF3 | 74 km | 4.0 mi | 0 |
| Jun 16, 1992 | EF3 | 66 km | 3.0 mi | 0 |
| Jun 16, 1992 | EF3 | 94 km | 12.0 mi | 0 |
| Apr 20, 1985 | EF3 | 65 km | 8.0 mi | 0 |
| Aug 3, 1981 | EF3 | 55 km | 12.8 mi | 0 |
| Jul 5, 1978 | EF3 | 69 km | 8.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 18°F (-8°C) | 0.5 in | Coldest, Driest |
| February | 22°F (-5°C) | 1.0 in | |
| March | 35°F (2°C) | 1.4 in | |
| April | 47°F (8°C) | 3.1 in | |
| May | 59°F (15°C) | 3.7 in | |
| June | 70°F (21°C) | 4.3 in | Wettest |
| July | 74°F (24°C) | 3.4 in | Warmest |
| August | 72°F (22°C) | 3.5 in | |
| September | 64°F (18°C) | 3.2 in | |
| October | 50°F (10°C) | 2.1 in | |
| November | 35°F (2°C) | 1.1 in | |
| December | 23°F (-5°C) | 0.8 in |
Lyons has a seasonal temperature swing of 57°F / from 18°F in January to 74°F in July. Total annual precipitation is 27.9 inches, with June being the wettest month (4.3") and January the driest (0.5").