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Monthly climate in Koster, North-West, South Africa

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Koster features a humid subtropical climate (Cwa).Temperatures typically range between 12 °C (54 °F) and 23 °C (74 °F) through the year, but rarely can drop to 0 °C (32 °F) or can rise to as high as 38 °C (100 °F).The average annual precipitation amounts to about 588 mm (23.1 inches) and receives 75 rainy days on the 1 mm (0.04 inches) threshold annually.Koster enjoys an average of 4033 hours of sunshine throughout the year, and daylight varies from 10 hours 31 minutes to 13 hours 42 minutes per day.

Monthly average temperatures in Koster, North-West, South Africa §

The warmest months in Koster are January, November and December, with daily mean temperatures ranging from 23 to 23 °C (73 - 74 °F) throughout the day. The coldest temperatures usually occur in May, June and July, when daily mean temperatures range from 12 to 15 °C (54 - 59 °F) throughout the day. On average each year, Koster experiences 185 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Koster, North-West, South Africa.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 37°C
(99°F)		 33°C
(92°F)		 35°C
(95°F)		 31°C
(89°F)		 27°C
(80°F)		 26°C
(79°F)		 26°C
(79°F)		 29°C
(85°F)		 35°C
(95°F)		 36°C
(98°F)		 36°C
(97°F)		 38°C
(100°F)
Mean maximum 33°C
(92°F)		 32°C
(90°F)		 31°C
(89°F)		 30°C
(85°F)		 26°C
(79°F)		 24°C
(76°F)		 25°C
(78°F)		 28°C
(83°F)		 33°C
(92°F)		 35°C
(95°F)		 35°C
(95°F)		 34°C
(94°F)
Average high 29°C
(84°F)		 27°C
(82°F)		 27°C
(81°F)		 24°C
(76°F)		 23°C
(73°F)		 21°C
(70°F)		 20°C
(69°F)		 24°C
(75°F)		 28°C
(82°F)		 28°C
(83°F)		 29°C
(85°F)		 29°C
(84°F)
Daily mean 23°C
(74°F)		 22°C
(72°F)		 21°C
(70°F)		 18°C
(65°F)		 15°C
(59°F)		 12°C
(55°F)		 12°C
(54°F)		 16°C
(61°F)		 20°C
(68°F)		 21°C
(71°F)		 23°C
(73°F)		 23°C
(73°F)
Average low 18°C
(65°F)		 18°C
(64°F)		 16°C
(61°F)		 13°C
(56°F)		 9°C
(48°F)		 6°C
(42°F)		 5°C
(42°F)		 9°C
(48°F)		 12°C
(54°F)		 15°C
(58°F)		 16°C
(61°F)		 17°C
(63°F)
Mean minimum 15°C
(59°F)		 15°C
(59°F)		 12°C
(55°F)		 9°C
(48°F)		 5°C
(41°F)		 2°C
(36°F)		 1°C
(35°F)		 3°C
(38°F)		 5°C
(41°F)		 9°C
(49°F)		 11°C
(53°F)		 14°C
(57°F)
Minimum 13°C
(56°F)		 13°C
(56°F)		 10°C
(51°F)		 8°C
(46°F)		 2°C
(36°F)		 1°C
(34°F)		 -0°C
(32°F)		 2°C
(35°F)		 3°C
(38°F)		 8°C
(46°F)		 7°C
(45°F)		 12°C
(55°F)

Compare climate in Koster with other places

Compare temperature, precipitation, sunshine, UV index in Koster, North-West, South Africa with other places around the world.

Monthly average precipitation in Koster, North-West, South Africa §

Koster usually has the most precipitation in January, February and December, with an average of 13 rainy days and 118 mm (4.7 inches) of precipitation per month.The driest months in Koster are July, August and September. On average, 3 mm (0.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Koster, North-West, South Africa.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) 106 (4.2) 128 (5.0) 53 (2.1) 43 (1.7) 9 (0.4) 5 (0.2) 2 (0.1) 1 (0.1) 5 (0.2) 47 (1.9) 67 (2.7) 120 (4.7)
Average precipitation days (≥ 1 mm) 11 14 9 7 1 0 1 0 1 6 11 14

Monthly sunshine hours in Koster, North-West, South Africa §

The sunniest months in Koster are October, November and December, when the sun shines an average of 12 hours 12 minutes a day.Least sunny months in Koster: January, June and July receive an average of 10 hours 1 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Koster, North-West, South Africa.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 306 318 357 320 322 300 315 329 337 369 375 378
Mean daily daylight hours 13h 31m 12h 56m 12h 12m 11h 26m 10h 49m 10h 31m 10h 41m 11h 13m 11h 56m 12h 42m 13h 22m 13h 42m

Solar UV radiation in Koster, North-West, South Africa §

Koster experiences the highest level of ultraviolet (UV) radiation in January, February and December, when the maximum UV index can reach values of 15 - 16, which corresponds to the Extreme category of sun exposure.May, June and July are in the High exposure category. In these months, the maximum values of the UV index do not exceed 7. For more detailed information, check out our hourly Koster UV Index data.

Average daily maximum UV levels by month for Koster, North-West, South Africa.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) 16 15 13 11 7 6 6 9 11 13 14 16