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Monthly climate in Duncan, South Carolina, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Duncan features a humid subtropical climate (Cfa).Temperatures typically range between 6 °C (43 °F) and 26 °C (80 °F) through the year, but rarely can drop to -14 °C (7 °F) or can rise to as high as 36 °C (97 °F).The average annual precipitation amounts to about 1356 mm (53.4 inches) and receives 128 rainy days on the 1 mm (0.04 inches) threshold annually.Duncan enjoys an average of 3053 hours of sunshine throughout the year, and daylight varies from 9 hours 49 minutes to 14 hours 27 minutes per day.

Monthly average temperatures in Duncan, South Carolina, United States §

The warmest months in Duncan are June, July and August, with daily mean temperatures ranging from 24 to 26 °C (76 - 80 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 6 to 9 °C (43 - 48 °F) throughout the day. On average each year, Duncan experiences 134 days above 25 °C (77.0 °F) and 41 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Duncan, South Carolina, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 25°C
(77°F)		 26°C
(78°F)		 31°C
(88°F)		 29°C
(85°F)		 36°C
(97°F)		 34°C
(94°F)		 36°C
(96°F)		 36°C
(97°F)		 35°C
(95°F)		 36°C
(97°F)		 26°C
(79°F)		 24°C
(76°F)
Mean maximum 21°C
(70°F)		 24°C
(76°F)		 27°C
(80°F)		 28°C
(83°F)		 32°C
(91°F)		 33°C
(92°F)		 35°C
(95°F)		 34°C
(94°F)		 33°C
(92°F)		 31°C
(88°F)		 24°C
(76°F)		 21°C
(69°F)
Average high 11°C
(52°F)		 15°C
(59°F)		 18°C
(64°F)		 22°C
(72°F)		 26°C
(80°F)		 29°C
(85°F)		 32°C
(89°F)		 31°C
(87°F)		 28°C
(83°F)		 23°C
(74°F)		 16°C
(61°F)		 13°C
(56°F)
Daily mean 6°C
(43°F)		 9°C
(48°F)		 12°C
(53°F)		 16°C
(61°F)		 21°C
(70°F)		 24°C
(76°F)		 26°C
(80°F)		 25°C
(78°F)		 23°C
(74°F)		 18°C
(64°F)		 10°C
(50°F)		 8°C
(46°F)
Average low 1°C
(34°F)		 4°C
(39°F)		 6°C
(44°F)		 10°C
(50°F)		 15°C
(60°F)		 19°C
(67°F)		 21°C
(71°F)		 21°C
(70°F)		 18°C
(65°F)		 13°C
(55°F)		 4°C
(40°F)		 3°C
(37°F)
Mean minimum -9°C
(16°F)		 -5°C
(23°F)		 -4°C
(25°F)		 -0°C
(32°F)		 6°C
(43°F)		 14°C
(58°F)		 17°C
(63°F)		 16°C
(62°F)		 11°C
(53°F)		 2°C
(36°F)		 -4°C
(25°F)		 -5°C
(23°F)
Minimum -14°C
(7°F)		 -5°C
(23°F)		 -6°C
(22°F)		 -3°C
(27°F)		 3°C
(38°F)		 11°C
(52°F)		 15°C
(59°F)		 14°C
(58°F)		 8°C
(46°F)		 -2°C
(29°F)		 -5°C
(23°F)		 -7°C
(19°F)

Compare climate in Duncan with other places

Compare temperature, precipitation, sunshine, UV index in Duncan, South Carolina, United States with other places around the world.

Monthly average precipitation in Duncan, South Carolina, United States §

Duncan usually has the most precipitation in February, September and October, with an average of 10 rainy days and 138 mm (5.4 inches) of precipitation per month.The driest months in Duncan are June, July and November. On average, 84 mm (3.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Duncan, South Carolina, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 98 (3.9) 136 (5.4) 100 (4.0) 126 (5.0) 128 (5.0) 77 (3.0) 82 (3.2) 109 (4.3) 144 (5.7) 133 (5.2) 93 (3.6) 130 (5.1)
Average precipitation days (≥ 1 mm) 9 12 12 8 11 13 15 13 9 10 7 9

Monthly sunshine hours in Duncan, South Carolina, United States §

The sunniest months in Duncan are June, July and August, when the sun shines an average of 10 hours 23 minutes a day.Least sunny months in Duncan: January, February and December receive an average of 5 hours 51 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Duncan, South Carolina, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 164 173 233 268 295 312 335 307 283 255 228 195
Mean daily daylight hours 10h 5m 10h 55m 11h 59m 13h 5m 14h 0m 14h 27m 14h 13m 13h 24m 12h 20m 11h 15m 10h 18m 9h 49m

Solar UV radiation in Duncan, South Carolina, United States §

Duncan experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 11 - 11, which corresponds to the Extreme category of sun exposure.January, November and December are in the Moderate / High exposure category. In these months, the maximum values of the UV index do not exceed 6. For more detailed information, check out our hourly Duncan UV Index data.

Average daily maximum UV levels by month for Duncan, South Carolina, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 4 7 8 10 11 11 11 10 9 8 6 4