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Monthly climate in Irmo, South Carolina, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Irmo features a humid subtropical climate (Cfa).Temperatures typically range between 9 °C (48 °F) and 27 °C (81 °F) through the year, but rarely can drop to -7 °C (19 °F) or can rise to as high as 36 °C (97 °F).The average annual precipitation amounts to about 1222 mm (48.1 inches) and receives 124 rainy days on the 1 mm (0.04 inches) threshold annually.Irmo enjoys an average of 3159 hours of sunshine throughout the year, and daylight varies from 9 hours 55 minutes to 14 hours 21 minutes per day.

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

The warmest months in Irmo are June, July and August, with daily mean temperatures ranging from 26 to 27 °C (78 - 81 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 9 to 12 °C (48 - 53 °F) throughout the day. On average each year, Irmo experiences 154 days above 25 °C (77.0 °F) and 10 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Irmo, 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
(78°F)		 26°C
(78°F)		 28°C
(83°F)		 30°C
(86°F)		 36°C
(97°F)		 36°C
(97°F)		 36°C
(97°F)		 35°C
(95°F)		 36°C
(97°F)		 36°C
(97°F)		 28°C
(83°F)		 25°C
(78°F)
Mean maximum 22°C
(73°F)		 25°C
(77°F)		 27°C
(80°F)		 29°C
(85°F)		 33°C
(91°F)		 33°C
(92°F)		 35°C
(95°F)		 34°C
(93°F)		 34°C
(93°F)		 32°C
(90°F)		 26°C
(79°F)		 22°C
(72°F)
Average high 14°C
(57°F)		 17°C
(62°F)		 19°C
(67°F)		 23°C
(74°F)		 28°C
(82°F)		 30°C
(86°F)		 32°C
(90°F)		 31°C
(88°F)		 30°C
(86°F)		 25°C
(78°F)		 18°C
(65°F)		 15°C
(59°F)
Daily mean 9°C
(48°F)		 12°C
(53°F)		 14°C
(57°F)		 18°C
(64°F)		 23°C
(73°F)		 26°C
(78°F)		 27°C
(81°F)		 27°C
(80°F)		 25°C
(77°F)		 20°C
(69°F)		 13°C
(55°F)		 10°C
(51°F)
Average low 5°C
(41°F)		 7°C
(44°F)		 9°C
(48°F)		 13°C
(55°F)		 18°C
(65°F)		 22°C
(71°F)		 24°C
(75°F)		 23°C
(74°F)		 21°C
(70°F)		 16°C
(61°F)		 8°C
(47°F)		 6°C
(43°F)
Mean minimum -4°C
(26°F)		 -1°C
(30°F)		 -1°C
(30°F)		 4°C
(40°F)		 9°C
(49°F)		 17°C
(63°F)		 21°C
(69°F)		 20°C
(68°F)		 15°C
(59°F)		 7°C
(45°F)		 0°C
(32°F)		 -1°C
(30°F)
Minimum -7°C
(19°F)		 -2°C
(28°F)		 -3°C
(28°F)		 1°C
(35°F)		 8°C
(46°F)		 14°C
(57°F)		 18°C
(65°F)		 18°C
(65°F)		 11°C
(53°F)		 2°C
(37°F)		 -2°C
(28°F)		 -4°C
(24°F)

Compare climate in Irmo with other places

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

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

Irmo usually has the most precipitation in July, August and December, with an average of 14 rainy days and 134 mm (5.3 inches) of precipitation per month.The driest months in Irmo are March, October and November. On average, 75 mm (2.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Irmo, 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) 85 (3.3) 108 (4.3) 79 (3.1) 107 (4.2) 102 (4.0) 99 (3.9) 142 (5.6) 137 (5.4) 93 (3.7) 77 (3.0) 68 (2.7) 124 (4.9)
Average precipitation days (≥ 1 mm) 9 10 9 8 9 13 15 16 8 8 8 11

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

The sunniest months in Irmo are June, July and August, when the sun shines an average of 10 hours 28 minutes a day.Least sunny months in Irmo: January, February and December receive an average of 6 hours 5 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Irmo, 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 169 182 246 285 307 310 342 310 293 273 236 202
Mean daily daylight hours 10h 10m 10h 58m 11h 59m 13h 2m 13h 55m 14h 21m 14h 7m 13h 20m 12h 20m 11h 17m 10h 22m 9h 55m

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

Irmo experiences the highest level of ultraviolet (UV) radiation in June, July and August, 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 Irmo UV Index data.

Average daily maximum UV levels by month for Irmo, 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 10 11 11 11 9 8 6 4