Green Grass, SD

Full City Profile · South Dakota · Corson County County

4.5 /5.0
A+ Excellent
80 Population 10/sq mi density
48°F Avg Temperature
A+
Overall
4.5 / 5.0
Strong
A
Education
4.5 / 5.0
0.0% bachelor's degree or higher
Green Grass experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 21°F in January while summers reach 75°F in July. Annual precipitation totals 19.1 inches. The area receives 36.8 inches of snow annually.

Temperature

21°F Jan (-6°C) 75°F Jul (24°C)
Annual Average47.8°F
11% below US avg
January Average21°F (-6°C)
July Average75°F (24°C)

Geography

Elevation2,017 ft (615 m)
Area8.1 sq mi (21.1 km²)
Population Density10/sq mi
Coordinates45.1566°N, 101.2870°W
TimezoneAmerica/Chicago
CountyCorson County County
Nearest AirportPierre Regional (PIR)
73 miles away

Precipitation & Snow

Annual Rainfall 19.1"
50% below US avg
Snowfall 36.8"
Wettest Month (Jun) 3.70"
Driest Month (Jan) 0.31"

Air Quality

Natural Hazard Risk

Overall RiskVery Low
Risk Score38.1 / 100
Social Vulnerability91.2 / 100
Community Resilience2.9 / 100

Hazard Breakdown

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

Earthquake History

6 earthquakes (M2.5+) within 150 km since 1990. Strongest: M3.7. Most recent: M2.6 on Jun 8, 2025.

May 30, 2024 38 km NNW of Pierre, South Dakota M3.7 79 km
Aug 9, 2011 2 km S of Fort Pierre, South Dakota M3.3 117 km
Aug 5, 2022 4 km ENE of Draper, South Dakota M3.2 150 km
Aug 15, 2017 8 km E of Agar, South Dakota M3.0 110 km
Jun 8, 2025 19 km NW of Wasta, South Dakota M2.6 149 km
Jun 16, 2021 15 km N of Quinn, South Dakota M2.6 131 km
Source: USGS (M2.5+, 1990-2025)

Tornado History

144 tornadoes (EF0+) within 100 km since 1950. Strongest: EF3. Total: 17 injuries.

Date Rating Distance Fatalities
Jun 21, 1983 EF3 43 km 0
Jun 20, 1968 EF3 93 km 0
Jun 2, 2024 EF2 89 km 0
Jun 16, 2010 EF2 29 km 0
Jun 16, 2010 EF2 11 km 0
May 24, 2010 EF2 75 km 0
May 24, 2010 EF2 68 km 0
May 24, 2010 EF2 96 km 0
Jul 18, 1986 EF2 84 km 0
May 19, 1974 EF2 92 km 0
May 19, 1974 EF2 99 km 0
Jul 18, 1970 EF2 78 km 0
Aug 12, 1969 EF2 81 km 0
Jul 7, 1969 EF2 75 km 0
Jun 20, 1968 EF2 98 km 0
Jun 8, 1964 EF2 47 km 0
Aug 24, 1960 EF2 90 km 0
Aug 31, 1959 EF2 96 km 0
Apr 19, 1955 EF2 15 km 0
Apr 19, 1955 EF2 93 km 0
Source: NOAA SPC (EF0+, 1950-2024)

Wildfire History

20 wildfires (100+ acres) within 100 km. Largest: LAPLANTE (14,777 ac, 2002).

Year Name Acres Distance
2002 LAPLANTE 14,777 50 km
1991 UNNAMED 14,487 62 km
1999 FAITH 12,629 72 km
2000 GENO H. 10,423 58 km
2006 STONE MAN CHURCH 10,389 61 km
2000 TRIBLE 9,718 98 km
2000 HOUCK RANCH 8,746 66 km
2006 BLACK HORSE CREEK 8,000 77 km
1999 BULLHEAD 5,606 65 km
2006 KELLY 5,071 82 km
2022 HWY31 AND 101ST WEST 4,879 95 km
2000 JENSEN 4,739 35 km
2000 HAYES 4,627 79 km
2020 BENT RIM 3,665 29 km
2006 B WARD 1 3,325 51 km
2005 LITTLE BEND 2,789 63 km
2006 1804 2,778 87 km
2000 PASTURE 9 BURN 2,768 80 km
2012 MCINTOSH 2,653 88 km
2023 LITTLE BEND RX 2,574 63 km
Source: NIFC/IRWIN (100+ acres)

Monthly Weather

Month Avg Temperature Precipitation Summary
January 21°F (-6°C) 0.3 in Coldest, Driest
February 24°F (-4°C) 0.7 in
March 35°F (2°C) 1.0 in
April 47°F (8°C) 1.8 in
May 58°F (14°C) 3.0 in
June 68°F (20°C) 3.7 in Wettest
July 75°F (24°C) 2.4 in Warmest
August 74°F (23°C) 1.9 in
September 64°F (18°C) 1.4 in
October 49°F (10°C) 1.9 in
November 35°F (1°C) 0.5 in
December 24°F (-5°C) 0.6 in

Green Grass has a seasonal temperature swing of 55°F / from 21°F in January to 75°F in July. Total annual precipitation is 19.1 inches, with June being the wettest month (3.7") and January the driest (0.3").

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