Millbrook Colony, SD

Full City Profile · South Dakota · Hanson County County

54 Population 235/sq mi density
45°F Avg Temperature
Millbrook Colony has a cool climate with an average annual temperature of 45°F (7°C). Winters average 16°F in January while summers reach 72°F in July. Annual precipitation totals 25.3 inches. The area receives 36.3 inches of snow annually.

Temperature

16°F Jan (-9°C) 72°F Jul (22°C)
Annual Average45.0°F
17% below US avg
January Average16°F (-9°C)
July Average72°F (22°C)

Geography

Elevation1,312 ft (400 m)
Area0.2 sq mi (0.6 km²)
Population Density235/sq mi
Coordinates43.6681°N, 97.8710°W
TimezoneAmerica/Chicago
CountyHanson County County
Nearest AirportMitchell Municipal (MHE)
11 miles away

Precipitation & Snow

Annual Rainfall 25.3"
33% below US avg
Snowfall 36.3"
Wettest Month (Jun) 3.97"
Driest Month (Jan) 0.47"

Air Quality

Natural Hazard Risk

Overall RiskVery Low
Risk Score14.8 / 100
Social Vulnerability87.7 / 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 Moderate
Cold Wave Relatively Low
Landslide Very Low
Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

12 earthquakes (M2.5+) within 150 km since 1990. Strongest: M4.3. Most recent: M2.5 on Apr 27, 2025.

Nov 3, 2002 16 km SSW of Butte, Nebraska M4.3 130 km
Jun 4, 2021 10 km NE of Anoka, Nebraska M3.7 101 km
Oct 25, 1990 8 km N of Plankinton, South Dakota M3.6 50 km
Feb 6, 1996 1 km N of Wausa, Nebraska M3.6 131 km
Jun 4, 2021 9 km ENE of Anoka, Nebraska M3.1 102 km
Jul 26, 2002 0 km WSW of Huron, South Dakota M3.1 82 km
Jan 4, 2021 5 km N of Tyndall, South Dakota M3.1 70 km
Feb 7, 2014 11 km NE of Bijou Hills, South Dakota M3.0 97 km
Jul 3, 1995 9 km SSW of Fort Thompson, South Dakota M2.8 136 km
Apr 27, 2025 9 km NE of Burke, South Dakota M2.5 119 km
Jan 16, 2022 9 km NE of Plankinton, South Dakota M2.5 44 km
Mar 6, 2024 6 km SSE of Santee, Nebraska M2.5 98 km
Source: USGS (M2.5+, 1990-2025)

Tornado History

575 tornadoes (EF0+) within 100 km since 1950. Strongest: EF4. Total: 8 fatalities, 245 injuries.

Date Rating Distance Fatalities
Jun 18, 2014 EF4 59 km 0
Jun 24, 2003 EF4 69 km 0
May 30, 1998 EF4 18 km 6
Jun 7, 1993 EF4 53 km 0
Jun 7, 1993 EF4 77 km 0
Jun 7, 1965 EF4 76 km 1
May 5, 2007 EF3 44 km 0
Jun 24, 2003 EF3 52 km 0
Jun 24, 2003 EF3 79 km 0
Jun 7, 1993 EF3 81 km 0
Jun 7, 1993 EF3 50 km 0
Jun 7, 1993 EF3 76 km 0
May 7, 1993 EF3 47 km 0
Jun 16, 1992 EF3 53 km 0
Jun 16, 1992 EF3 94 km 0
Aug 3, 1981 EF3 72 km 0
Jun 15, 1970 EF3 91 km 0
Jun 20, 1968 EF3 9 km 0
Jun 26, 1965 EF3 78 km 0
Jun 21, 1965 EF3 80 km 0
Source: NOAA SPC (EF0+, 1950-2024)

Wildfire History

3 wildfires (100+ acres) within 100 km. Largest: SIX PACK (1,649 ac, 2012).

Year Name Acres Distance
2012 SIX PACK 1,649 98 km
2023 SDLDR-HFR-FY23-RX-BROKEN ARROW UNITS B-C-D-E-G-H-I 1,185 71 km
2009 TAHOHPI WUI RX 1,166 90 km
Source: NIFC/IRWIN (100+ acres)

Monthly Weather

Month Avg Temperature Precipitation Summary
January 16°F (-9°C) 0.5 in Coldest, Driest
February 20°F (-7°C) 0.7 in
March 32°F (0°C) 1.1 in
April 45°F (7°C) 2.9 in
May 57°F (14°C) 3.6 in
June 67°F (20°C) 4.0 in Wettest
July 72°F (22°C) 3.1 in Warmest
August 70°F (21°C) 3.0 in
September 62°F (17°C) 2.8 in
October 47°F (9°C) 2.0 in
November 32°F (0°C) 0.9 in
December 20°F (-7°C) 0.6 in

Millbrook Colony has a seasonal temperature swing of 57°F / from 16°F in January to 72°F in July. Total annual precipitation is 25.3 inches, with June being the wettest month (4.0") and January the driest (0.5").

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