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Monthly climate in Castlewellan, Northern Ireland, United Kingdom

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Castlewellan features a oceanic climate (Cfb).Temperatures typically range between 6 °C (43 °F) and 15 °C (60 °F) through the year, but rarely can drop to -3 °C (27 °F) or can rise to as high as 24 °C (76 °F).The average annual precipitation amounts to about 1058 mm (41.7 inches) and receives 175 rainy days on the 1 mm (0.04 inches) threshold annually.Castlewellan enjoys an average of 3035 hours of sunshine throughout the year, and daylight varies from 7 hours 24 minutes to 17 hours 5 minutes per day.

Monthly average temperatures in Castlewellan, Northern Ireland, United Kingdom §

The warmest months in Castlewellan are June, July and August, with daily mean temperatures ranging from 14 to 15 °C (57 - 60 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 6 to 7 °C (43 - 44 °F) throughout the day. On average each year, Castlewellan experiences 0 days above 25 °C (77.0 °F) and 2 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Castlewellan, Northern Ireland, United Kingdom.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 13°C
(56°F)		 12°C
(55°F)		 14°C
(58°F)		 16°C
(61°F)		 19°C
(67°F)		 24°C
(75°F)		 24°C
(76°F)		 21°C
(69°F)		 20°C
(69°F)		 18°C
(64°F)		 14°C
(58°F)		 13°C
(55°F)
Mean maximum 12°C
(53°F)		 12°C
(53°F)		 13°C
(55°F)		 14°C
(58°F)		 18°C
(64°F)		 19°C
(67°F)		 22°C
(71°F)		 20°C
(68°F)		 19°C
(66°F)		 16°C
(62°F)		 14°C
(57°F)		 12°C
(54°F)
Average high 8°C
(46°F)		 8°C
(47°F)		 9°C
(48°F)		 10°C
(51°F)		 13°C
(56°F)		 16°C
(61°F)		 18°C
(64°F)		 17°C
(63°F)		 16°C
(60°F)		 13°C
(55°F)		 10°C
(50°F)		 8°C
(47°F)
Daily mean 6°C
(43°F)		 6°C
(43°F)		 7°C
(44°F)		 8°C
(47°F)		 11°C
(52°F)		 14°C
(57°F)		 15°C
(60°F)		 15°C
(59°F)		 13°C
(56°F)		 11°C
(52°F)		 8°C
(47°F)		 7°C
(44°F)
Average low 4°C
(40°F)		 4°C
(40°F)		 5°C
(40°F)		 6°C
(43°F)		 8°C
(47°F)		 11°C
(53°F)		 13°C
(56°F)		 13°C
(56°F)		 11°C
(53°F)		 9°C
(49°F)		 7°C
(44°F)		 5°C
(42°F)
Mean minimum 0°C
(32°F)		 0°C
(33°F)		 1°C
(34°F)		 2°C
(35°F)		 4°C
(39°F)		 8°C
(46°F)		 10°C
(50°F)		 9°C
(49°F)		 7°C
(45°F)		 5°C
(41°F)		 2°C
(37°F)		 2°C
(35°F)
Minimum -2°C
(29°F)		 -1°C
(31°F)		 -3°C
(27°F)		 -0°C
(32°F)		 2°C
(35°F)		 7°C
(44°F)		 9°C
(48°F)		 9°C
(48°F)		 5°C
(41°F)		 2°C
(37°F)		 1°C
(34°F)		 -0°C
(32°F)

Compare climate in Castlewellan with other places

Compare temperature, precipitation, sunshine, UV index in Castlewellan, Northern Ireland, United Kingdom with other places around the world.

Monthly average precipitation in Castlewellan, Northern Ireland, United Kingdom §

Castlewellan usually has the most precipitation in August, November and December, with an average of 16 rainy days and 112 mm (4.4 inches) of precipitation per month.The driest months in Castlewellan are January, April and May. On average, 60 mm (2.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Castlewellan, Northern Ireland, United Kingdom.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) 68 (2.7) 99 (3.9) 92 (3.6) 47 (1.8) 66 (2.6) 78 (3.1) 85 (3.3) 120 (4.7) 83 (3.3) 104 (4.1) 113 (4.5) 104 (4.1)
Average precipitation days (≥ 1 mm) 12 17 16 9 12 14 14 18 16 17 16 14

Monthly sunshine hours in Castlewellan, Northern Ireland, United Kingdom §

The sunniest months in Castlewellan are May, June and July, when the sun shines an average of 12 hours 59 minutes a day.Least sunny months in Castlewellan: January, November and December receive an average of 3 hours 4 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Castlewellan, Northern Ireland, United Kingdom.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 80 149 208 321 402 394 398 349 294 231 115 87
Mean daily daylight hours 7h 58m 9h 45m 11h 54m 14h 6m 16h 3m 17h 5m 16h 31m 14h 46m 12h 38m 10h 27m 8h 28m 7h 24m

Solar UV radiation in Castlewellan, Northern Ireland, United Kingdom §

Castlewellan experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 7 - 8, which corresponds to the High / Very High category of sun exposure.January, February and December are in the Low exposure category. In these months, the maximum values of the UV index do not exceed 2. For more detailed information, check out our hourly Castlewellan UV Index data.

Average daily maximum UV levels by month for Castlewellan, Northern Ireland, United Kingdom.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) 1 2 4 5 7 8 8 6 5 3 2 1