Weather & Climate in Green Grass, SD

Temperature, precipitation, air quality, natural hazards, and monthly weather data.

Green Grass has a cool climate with an average annual temperature of 45°F (7°C). Winters average 17°F in January while summers reach 73°F in July. The area gets 311 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 19.4 inches (drier than the 38-inch national average). The area receives 41.2 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 35. The city sits at an elevation of 2,017 feet.

Temperature

17°F Jan (-8°C) 73°F Jul (23°C)

Annual Average	45.3°F
	16% below US avg
January Average	17°F (-8°C)
July Average	73°F (23°C)
Sunny Days	311 days/yr

Geography

Elevation	2,017 ft (615 m)
Area	8.1 sq mi (21.1 km²)
Population Density	10/sq mi
Coordinates	45.1566°N, 101.2870°W
Timezone	America/Chicago
County	Corson County County
Nearest Airport	Pierre Regional (PIR) 73 miles away

Precipitation & Snow

Annual Rainfall 19.4"

49% below US avg

Snowfall 41.2"

Wettest Month (Jun) 3.19"

Driest Month (Jan) 0.35"

Air Quality

AQI Median	35.0
Rating	Good

Natural Hazard Risk

Overall Risk	Very Low
Risk Score	38.1 / 100
Social Vulnerability	91.2 / 100
Community Resilience	2.9 / 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+) recorded within 150 km since 1990. Strongest on record: M3.7.

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

Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

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

Date	Rating	Distance	Path	Fatalities
Jun 21, 1983	EF3	43 km	6.0 mi	0
Jun 20, 1968	EF3	93 km	8.8 mi	0
Jun 2, 2024	EF2	89 km	4.1 mi	0
Jun 16, 2010	EF2	29 km	1.4 mi	0
Jun 16, 2010	EF2	11 km	0.4 mi	0
May 24, 2010	EF2	75 km	8.2 mi	0
May 24, 2010	EF2	68 km	22.9 mi	0
May 24, 2010	EF2	96 km	22.3 mi	0
Jul 18, 1986	EF2	84 km	10.5 mi	0
May 19, 1974	EF2	92 km	5.6 mi	0
May 19, 1974	EF2	99 km	2.7 mi	0
Jul 18, 1970	EF2	78 km	0.1 mi	0
Aug 12, 1969	EF2	81 km	6.1 mi	0
Jul 7, 1969	EF2	75 km	0.1 mi	0
Jun 20, 1968	EF2	98 km	0.1 mi	0
Jun 8, 1964	EF2	47 km	3.8 mi	0
Aug 24, 1960	EF2	90 km	13.6 mi	0
Aug 31, 1959	EF2	96 km	0.1 mi	0
Apr 19, 1955	EF2	15 km	0.1 mi	0
Apr 19, 1955	EF2	93 km	18.2 mi	0

Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Wildfire History

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

Year	Name	Acres Burned	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 Wildfire Records (100+ acres).

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	17°F (-8°C)	0.4 in	Coldest, Driest
February	22°F (-5°C)	0.5 in
March	32°F (-0°C)	1.3 in
April	45°F (7°C)	2.2 in
May	57°F (14°C)	3.1 in
June	67°F (19°C)	3.2 in	Wettest
July	73°F (23°C)	2.3 in	Warmest
August	72°F (22°C)	1.8 in
September	61°F (16°C)	1.3 in
October	48°F (9°C)	1.2 in
November	31°F (-0°C)	0.5 in
December	20°F (-7°C)	0.5 in

Green Grass has a seasonal temperature swing of 56°F / from 17°F in January to 73°F in July. Total annual precipitation is 18.1 inches, with June being the wettest month (3.2") and January the driest (0.4").

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