Weather & Climate in Henry, SD

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

Henry has a cool climate with an average annual temperature of 43°F (6°C). Winters average 12°F in January while summers reach 71°F in July. The area gets 276 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 22.7 inches (drier than the 38-inch national average). The area receives 41.1 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 1,812 feet.

Temperature

12°F Jan (-11°C) 71°F Jul (22°C)

Annual Average	43.0°F
	20% below US avg
January Average	12°F (-11°C)
July Average	71°F (22°C)
Sunny Days	276 days/yr

Geography

Elevation	1,812 ft (552 m)
Area	1.5 sq mi (3.8 km²)
Population Density	170/sq mi
Coordinates	44.8809°N, 97.4616°W
Timezone	America/Chicago
County	Clark County County
Nearest Airport	Watertown Regional (ATY) 15 miles away

Precipitation & Snow

Annual Rainfall 22.7"

40% below US avg

Snowfall 41.1"

Wettest Month (Jun) 3.70"

Driest Month (Dec) 0.43"

Air Quality

AQI Median	35.0
Rating	Good

Natural Hazard Risk

Overall Risk	Very Low
Risk Score	4.6 / 100
Social Vulnerability	10.6 / 100
Community Resilience	61.2 / 100

Hazard Breakdown

Tornado	Very Low
Earthquake	Very Low
Wildfire	Very Low
Flood	Very Low
Hail	Relatively Low
Strong Wind	Very Low
Heat Wave	Very Low
Winter Weather	Relatively Low
Lightning	Very Low
Ice Storm	Relatively Low
Drought	No Rating
Cold Wave	Relatively Low
Landslide	Very 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: M4.1.

Jun 5, 1993	11 km N of Johnson, Minnesota	M4.1	127 km	10 km
Oct 20, 1995	8 km SSE of New Effington, South Dakota	M3.7	111 km	5 km
Oct 25, 1990	8 km N of Plankinton, South Dakota	M3.6	145 km	5 km
Jul 26, 2002	0 km WSW of Huron, South Dakota	M3.1	83 km	5 km
Jan 16, 2022	9 km NE of Plankinton, South Dakota	M2.5	145 km	5 km

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

Tornado History

451 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 4 fatalities, 59 injuries.

Date	Rating	Distance	Path	Fatalities
Jun 24, 2003	EF4	71 km	10.0 mi	0
May 30, 2022	EF3	51 km	13.3 mi	0
Jun 24, 2003	EF3	73 km	3.5 mi	0
May 17, 1996	EF3	77 km	18.0 mi	0
Jun 7, 1993	EF3	95 km	5.0 mi	0
Jun 16, 1992	EF3	89 km	3.0 mi	0
Jun 16, 1992	EF3	63 km	4.0 mi	0
May 12, 1984	EF3	21 km	27.0 mi	0
Jul 18, 1983	EF3	23 km	0.5 mi	0
Jul 1, 1973	EF3	91 km	0.3 mi	1
Jun 15, 1970	EF3	91 km	0.1 mi	0
Jun 25, 1969	EF3	80 km	1.5 mi	0
Jun 21, 1961	EF3	89 km	156.3 mi	1
May 30, 2022	EF2	55 km	12.4 mi	0
May 12, 2022	EF2	80 km	0.4 mi	0
May 12, 2022	EF2	39 km	2.0 mi	0
May 12, 2022	EF2	60 km	0.4 mi	0
May 5, 2007	EF2	91 km	1.0 mi	0
Aug 24, 2006	EF2	84 km	7.0 mi	0
Jun 24, 2003	EF2	53 km	2.2 mi	0

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

Wildfire History

19 wildfires (100+ acres) recorded within 100 km. Largest: FISH FIRE (1,799 acres, 2004).

Year	Name	Acres Burned	Distance
2004	FISH FIRE	1,799	98 km
2004	TACOMA PARK PLACE	1,336	95 km
2005	GRAND MEWS	1,245	96 km
2000	PHEASANT OPENER	1,206	59 km
2009	TAHOHPI WUI RX	1,166	92 km
1998	LEE	1,137	94 km
1995	UNNAMED	1,115	95 km
2003	ANDERSON	1,082	97 km
1998	ANDREASEN	1,001	98 km
1992	SPRING LK	1,001	61 km
1990	ANDERSON	988	96 km
2007	ANDERSON	797	97 km
2006	ANDERSON	764	96 km
1986	ANDERSON	746	97 km
2000	FISH	720	97 km
2007	LEE	689	94 km
2003	LEE	560	93 km
1993	LEE	516	93 km
1995	ANDREASON	507	98 km

Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	12°F (-11°C)	0.6 in	Coldest
February	18°F (-8°C)	0.6 in
March	30°F (-1°C)	1.3 in
April	44°F (7°C)	2.0 in
May	57°F (14°C)	2.9 in
June	67°F (19°C)	3.7 in	Wettest
July	71°F (22°C)	3.0 in	Warmest
August	69°F (21°C)	2.7 in
September	59°F (15°C)	2.0 in
October	47°F (8°C)	1.7 in
November	29°F (-2°C)	0.9 in
December	16°F (-9°C)	0.4 in	Driest

Henry has a seasonal temperature swing of 59°F / from 12°F in January to 71°F in July. Total annual precipitation is 21.8 inches, with June being the wettest month (3.7") and December the driest (0.4").

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