Weather & Climate in Sloan, IA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Sloan experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 20°F in January while summers reach 74°F in July. Annual precipitation totals 29.3 inches (drier than the 38-inch national average). The area receives 36.0 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 43. 79% of days have good air quality. The city sits at an elevation of 1,073 feet.
Temperature
20°F Jan (-7°C)
74°F Jul (23°C)
| Annual Average | 48.4°F |
| 10% below US avg | |
| January Average | 20°F (-7°C) |
| July Average | 74°F (23°C) |
Geography
| Elevation | 1,073 ft (327 m) |
| Area | 0.6 sq mi (1.6 km²) |
| Population Density | 1,524/sq mi |
| Coordinates | 42.2331°N, 96.2248°W |
| Timezone | America/Chicago |
| County | Woodbury County County |
| Nearest Airport | Sioux Gateway/Brig General Bud Day Field (SUX) 14 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
| Good Days % | 78.9% |
| Unhealthy Days | 0 |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 83.3 / 100 |
| Social Vulnerability | 39.4 / 100 |
| Community Resilience | 87.8 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Earthquake | Very Low |
| Wildfire | Relatively Low |
| Flood | Relatively Moderate |
| Hail | Relatively High |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively High |
| Lightning | Relatively Low |
| Ice Storm | Relatively High |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively 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.
| Feb 6, 1996 | 1 km N of Wausa, Nebraska | M3.6 | 113 km | 5 km |
| Aug 9, 1997 | 9 km NW of Clarkson, Nebraska | M3.4 | 93 km | 5 km |
| Feb 5, 2025 | 8 km SSE of Tilden, Nebraska | M2.7 | 133 km | 5 km |
| Jun 30, 2021 | 4 km E of Rembrandt, Iowa | M2.7 | 113 km | 10 km |
| Mar 6, 2024 | 6 km SSE of Santee, Nebraska | M2.5 | 144 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
569 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 12 fatalities, 236 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 16, 2014 | EF4 | 82 km | 23.9 mi | 1 |
| Jun 16, 2014 | EF4 | 54 km | 15.8 mi | 0 |
| Jun 16, 2014 | EF4 | 73 km | 11.5 mi | 1 |
| Jun 16, 2014 | EF4 | 99 km | 12.1 mi | 0 |
| Oct 4, 2013 | EF4 | 71 km | 18.3 mi | 0 |
| Oct 4, 2013 | EF4 | 15 km | 24.7 mi | 0 |
| Jun 23, 2003 | EF4 | 95 km | 13.0 mi | 1 |
| Jul 28, 1986 | EF4 | 79 km | 52.5 mi | 0 |
| Jul 7, 1977 | EF4 | 40 km | 22.6 mi | 0 |
| Jun 23, 1952 | EF4 | 65 km | 24.1 mi | 0 |
| Jul 15, 1950 | EF4 | 57 km | 10.0 mi | 0 |
| Jun 17, 2014 | EF3 | 91 km | 4.0 mi | 0 |
| Apr 9, 2011 | EF3 | 34 km | 3.4 mi | 0 |
| Apr 9, 2011 | EF3 | 78 km | 10.1 mi | 0 |
| Apr 9, 2011 | EF3 | 96 km | 29.4 mi | 0 |
| Jun 11, 2008 | EF3 | 49 km | 14.2 mi | 4 |
| May 16, 1999 | EF3 | 72 km | 6.2 mi | 0 |
| May 16, 1999 | EF3 | 76 km | 7.5 mi | 2 |
| Jul 5, 1994 | EF3 | 12 km | 1.8 mi | 0 |
| Jun 16, 1992 | EF3 | 74 km | 26.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Wildfire History
1 wildfire (100+ acres) recorded within 100 km. Largest: UNNAMED (629 acres, 2010).
| Year | Name | Acres Burned | Distance |
| 2010 | UNNAMED | 629 | 97 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 20°F (-7°C) | 0.7 in | Coldest, Driest |
| February | 25°F (-4°C) | 0.9 in | |
| March | 37°F (3°C) | 1.8 in | |
| April | 49°F (9°C) | 3.2 in | |
| May | 61°F (16°C) | 3.9 in | |
| June | 71°F (22°C) | 4.4 in | Wettest |
| July | 74°F (23°C) | 3.4 in | Warmest |
| August | 72°F (22°C) | 3.9 in | |
| September | 64°F (18°C) | 2.8 in | |
| October | 50°F (10°C) | 2.2 in | |
| November | 36°F (2°C) | 1.3 in | |
| December | 24°F (-4°C) | 1.0 in |
Sloan has a seasonal temperature swing of 54°F / from 20°F in January to 74°F in July. Total annual precipitation is 29.3 inches, with June being the wettest month (4.4") and January the driest (0.7").