Iroquois, SD

Full City Profile · South Dakota · Kingsbury County County

3.9 /5.0
B+ Good
425 Population 685/sq mi density
$60,750 Median Income $29,953 per capita
$138,500 Home Value $251,123 Zillow
$763 Median Rent 21.3% income on rent
46°F Avg Temperature
B+
Overall
3.9 / 5.0
Good overall score based on economy, affordability, safety and education
A
Economy
4.0 / 5.0
$60,750 median income, 3.2% unemployment
A+
Affordability
5.0 / 5.0
$138,500 home value, $763/mo rent
C+
Education
2.8 / 5.0
22.0% bachelor's degree or higher
Iroquois experiences four distinct seasons with an average annual temperature of 46°F (8°C). Winters average 16°F in January while summers reach 74°F in July. Annual precipitation totals 23.1 inches. The area receives 39.0 inches of snow annually.

Temperature

16°F Jan (-9°C) 74°F Jul (23°C)
Annual Average45.9°F
15% below US avg
January Average16°F (-9°C)
July Average74°F (23°C)

Geography

Elevation1,395 ft (425 m)
Area0.6 sq mi (1.6 km²)
Population Density685/sq mi
Coordinates44.3679°N, 97.8495°W
TimezoneAmerica/Chicago
CountyKingsbury County County
Nearest AirportHuron Regional (HON)
19 miles away

Precipitation & Snow

Annual Rainfall 23.1"
39% below US avg
Snowfall 39.0"
Wettest Month (Jun) 3.65"
Driest Month (Jan) 0.54"

Air Quality

Natural Hazard Risk

Overall RiskVery Low
Risk Score7.9 / 100
Social Vulnerability10.6 / 100
Community Resilience89.1 / 100

Hazard Breakdown

Tornado Relatively Low
Earthquake Very Low
Wildfire Very Low
Flood Very Low
Hail Relatively Low
Strong Wind Relatively Low
Heat Wave Very Low
Winter Weather Relatively Low
Lightning Very Low
Ice Storm Relatively Moderate
Drought Relatively Low
Cold Wave Relatively Low
Landslide Very Low
Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

6 earthquakes (M2.5+) within 150 km since 1990. Strongest: M3.6. Most recent: M2.5 on Jan 16, 2022.

Oct 25, 1990 8 km N of Plankinton, South Dakota M3.6 81 km
Jul 26, 2002 0 km WSW of Huron, South Dakota M3.1 29 km
Jan 4, 2021 5 km N of Tyndall, South Dakota M3.1 147 km
Feb 7, 2014 11 km NE of Bijou Hills, South Dakota M3.0 130 km
Jul 3, 1995 9 km SSW of Fort Thompson, South Dakota M2.8 138 km
Jan 16, 2022 9 km NE of Plankinton, South Dakota M2.5 80 km
Source: USGS (M2.5+, 1990-2025)

Tornado History

474 tornadoes (EF0+) within 100 km since 1950. Strongest: EF4. Total: 8 fatalities, 234 injuries.

Date Rating Distance Fatalities
Jun 18, 2014 EF4 57 km 0
Jun 24, 2003 EF4 12 km 0
May 30, 1998 EF4 70 km 6
Jun 7, 1993 EF4 71 km 0
May 30, 2022 EF3 94 km 0
May 5, 2007 EF3 89 km 0
Aug 24, 2006 EF3 74 km 0
Jun 24, 2003 EF3 56 km 0
Jun 24, 2003 EF3 14 km 0
Jun 7, 1993 EF3 69 km 0
Jun 7, 1993 EF3 89 km 0
Jun 7, 1993 EF3 78 km 0
Jun 7, 1993 EF3 81 km 0
May 7, 1993 EF3 96 km 0
Jun 16, 1992 EF3 41 km 0
Jun 16, 1992 EF3 54 km 0
May 12, 1984 EF3 58 km 0
Jul 18, 1983 EF3 80 km 0
Jun 15, 1970 EF3 76 km 0
Jun 20, 1968 EF3 77 km 0
Source: NOAA SPC (EF0+, 1950-2024)

Wildfire History

2 wildfires (100+ acres) within 100 km. Largest: GANN VALLEY (2,534 ac, 2000).

Year Name Acres Distance
2000 GANN VALLEY 2,534 87 km
2009 TAHOHPI WUI RX 1,166 43 km
Source: NIFC/IRWIN (100+ acres)

Monthly Weather

Month Avg Temperature Precipitation Summary
January 16°F (-9°C) 0.5 in Coldest, Driest
February 21°F (-6°C) 0.7 in
March 33°F (0°C) 1.1 in
April 46°F (8°C) 2.3 in
May 58°F (14°C) 2.9 in
June 68°F (20°C) 3.7 in Wettest
July 74°F (23°C) 3.3 in Warmest
August 71°F (22°C) 2.9 in
September 63°F (17°C) 2.4 in
October 48°F (9°C) 1.9 in
November 33°F (1°C) 0.8 in
December 21°F (-6°C) 0.7 in

Iroquois has a seasonal temperature swing of 58°F / from 16°F in January to 74°F in July. Total annual precipitation is 23.2 inches, with June being the wettest month (3.7") and January the driest (0.5").

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