Weather & Climate in Duncan, SC

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

Duncan enjoys a temperate climate with an average annual temperature of 61°F (16°C). Winters average 43°F in January while summers reach 80°F in July. The area gets 310 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 49.7 inches (wetter than the 38-inch national average). The area receives 3.9 inches of snow annually. Air quality is rated Good with a median AQI of 43. The city sits at an elevation of 765 feet.

Temperature

43°F Jan (6°C) 80°F Jul (27°C)

Annual Average	61.3°F
	14% above US avg
January Average	43°F (6°C)
July Average	80°F (27°C)
Sunny Days	310 days/yr

Geography

Elevation	765 ft (233 m)
Area	6.6 sq mi (17.1 km²)
Population Density	631/sq mi
Coordinates	34.9292°N, 82.1476°W
Timezone	America/New_York
County	Greenville County County
Nearest Airport	Greenville Spartanburg International (GSP) 5 miles away

Precipitation & Snow

Annual Rainfall 49.7"

31% above US avg

Snowfall 3.9"

Wettest Month (Mar) 5.31"

Driest Month (Apr) 3.54"

Air Quality

AQI Median	43.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively Moderate
Risk Score	94.0 / 100
Social Vulnerability	21.9 / 100
Community Resilience	57.3 / 100

Hazard Breakdown

Tornado	Relatively High
Hurricane	Relatively Moderate
Earthquake	Relatively Moderate
Wildfire	Very Low
Flood	Relatively High
Hail	Relatively Moderate
Strong Wind	Relatively High
Heat Wave	Relatively Moderate
Winter Weather	Relatively Low
Lightning	Very High
Ice Storm	Very High
Drought	Relatively Low
Cold Wave	Relatively High
Landslide	Relatively Low

Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

46 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.1.

Feb 15, 2014	12 km ENE of Parksville, South Carolina	M4.1	124 km	5 km
Jan 3, 1992	4 km ENE of Willington, South Carolina	M3.4	108 km	3 km
Jun 16, 2006	9 km W of Maggie Valley, North Carolina	M3.4	116 km	1 km
Jun 4, 2023	4 km NNW of West Canton, North Carolina	M3.2	98 km	0 km
Jun 5, 1998	4 km SSE of Mooresville, North Carolina	M3.2	142 km	9 km
Aug 23, 2025	3 km N of Coronaca, South Carolina	M3.0	72 km	2 km
Jan 1, 1993	4 km SSW of Spruce Pine, North Carolina	M3.0	106 km	2 km
Aug 4, 2007	12 km ENE of Lake Lure, North Carolina	M3.0	62 km	9 km
Feb 16, 2014	13 km WNW of Edgefield, South Carolina	M3.0	122 km	7 km
Aug 25, 2013	3 km NNE of Blowing Rock, North Carolina	M2.9	144 km	9 km
Feb 18, 2005	7 km ENE of Irmo, South Carolina	M2.9	131 km	1 km
Aug 23, 2025	3 km NNW of Coronaca, South Carolina	M2.9	71 km	7 km
Apr 26, 2013	9 km E of Lincolnton, Georgia	M2.8	130 km	12 km
Mar 6, 2006	3 km W of Burnsville, North Carolina	M2.8	111 km	4 km
Sep 18, 1996	6 km E of Clarks Hill, South Carolina	M2.8	139 km	14 km
Feb 12, 2021	8 km SW of Banner Hill, Tennessee	M2.8	130 km	3 km
May 23, 2023	4 km N of West Canton, North Carolina	M2.8	97 km	1 km
Aug 14, 2025	7 km N of Columbus, North Carolina	M2.7	44 km	6 km
Jan 7, 1992	5 km NNW of Edgefield, South Carolina	M2.7	123 km	3 km
Sep 2, 2001	10 km SW of Plum Branch, South Carolina	M2.7	127 km	21 km

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

Hurricane History

1 hurricane (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 2.

Year	Name	Category	Max Wind	Closest
1989	Hugo	Category 4	138 mph	99 km

Source: NOAA IBTrACS (Category 1+, 1980–2026).

Tornado History

396 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 24 fatalities, 518 injuries.

Date	Rating	Distance	Path	Fatalities
May 5, 1989	EF4	79 km	14.0 mi	4
May 5, 1989	EF4	26 km	15.0 mi	2
Mar 28, 1984	EF4	98 km	21.0 mi	5
Dec 13, 1973	EF4	84 km	1.0 mi	2
Apr 13, 2020	EF3	92 km	16.7 mi	1
Mar 15, 2008	EF3	86 km	27.5 mi	0
Aug 16, 1994	EF3	66 km	30.0 mi	0
Mar 28, 1984	EF3	95 km	19.0 mi	0
Apr 8, 1974	EF3	79 km	1.0 mi	0
Dec 13, 1973	EF3	89 km	17.7 mi	0
Dec 13, 1973	EF3	90 km	17.3 mi	1
Dec 13, 1973	EF3	73 km	10.7 mi	0
May 27, 1973	EF3	31 km	60.2 mi	0
May 10, 1952	EF3	17 km	22.7 mi	2
Mar 23, 2022	EF2	63 km	6.3 mi	0
May 3, 2021	EF2	98 km	29.4 mi	0
Apr 25, 2020	EF2	23 km	5.5 mi	0
Apr 13, 2020	EF2	48 km	8.0 mi	0
Feb 6, 2020	EF2	72 km	8.7 mi	0
Oct 23, 2017	EF2	15 km	3.0 mi	0

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

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: PARTY ROCK (8,572 acres, 2016).

Year	Name	Acres Burned	Distance
2016	PARTY ROCK	8,572	61 km
2016	PINNACLE MOUNTAIN	7,869	54 km
2016	CHESTNUT KNOB	6,418	89 km
2010	BURNING UNIT	5,567	70 km
2022	LOST BEAR RX FY2022	4,276	87 km
2016	CLEAR CREEK	3,493	88 km
2010	C-94-95 133 RX	3,192	66 km
2010	UNNAMED	2,909	69 km
2015	UNNAMED	2,690	80 km
2017	UNNAMED	2,514	54 km
2009	UNNAMED	2,458	79 km
2020	CHAMBERS-GRAPE-HICKORY AP	2,421	96 km
2017	UNNAMED	2,395	53 km
2017	UNNAMED	2,362	59 km
2013	UNNAMED	2,274	79 km
2013	UNNAMED	2,237	54 km
2013	LOST BEAR EAST	2,167	87 km
2010	C-142 RX	2,149	70 km
2021	UNNAMED	2,024	59 km
2019	UNNAMED	2,000	56 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	43°F (6°C)	4.5 in	Coldest
February	44°F (7°C)	4.3 in
March	52°F (11°C)	5.3 in	Wettest
April	59°F (15°C)	3.5 in	Driest
May	67°F (20°C)	4.5 in
June	75°F (24°C)	4.2 in
July	80°F (27°C)	4.5 in	Warmest
August	77°F (25°C)	4.2 in
September	71°F (22°C)	3.9 in
October	60°F (16°C)	4.1 in
November	51°F (10°C)	3.8 in
December	43°F (6°C)	4.0 in

Duncan has a seasonal temperature swing of 37°F / from 43°F in January to 80°F in July. Total annual precipitation is 50.8 inches, with March being the wettest month (5.3") and April the driest (3.5").

View full profile of Duncan, SC →