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Monthly climate in Castlerock, Northern Ireland, United Kingdom

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Castlerock features a oceanic climate (Cfb).Temperatures typically range between 7 °C (44 °F) and 14 °C (58 °F) through the year, but rarely can drop to -1 °C (31 °F) or can rise to as high as 19 °C (67 °F).The average annual precipitation amounts to about 1442 mm (56.8 inches) and receives 222 rainy days on the 1 mm (0.04 inches) threshold annually.Castlerock enjoys an average of 3002 hours of sunshine throughout the year, and daylight varies from 7 hours 13 minutes to 17 hours 17 minutes per day.

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

The warmest months in Castlerock are July, August and September, with daily mean temperatures ranging from 14 to 14 °C (57 - 58 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from 7 to 7 °C (44 - 45 °F) throughout the day. On average each year, Castlerock experiences 0 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 Castlerock, 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
(54°F)		 12°C
(54°F)		 13°C
(56°F)		 16°C
(61°F)		 17°C
(62°F)		 19°C
(67°F)		 18°C
(66°F)		 17°C
(64°F)		 16°C
(62°F)		 14°C
(58°F)		 12°C
(54°F)
Mean maximum 11°C
(53°F)		 11°C
(52°F)		 11°C
(52°F)		 12°C
(54°F)		 14°C
(58°F)		 15°C
(60°F)		 18°C
(64°F)		 18°C
(64°F)		 17°C
(63°F)		 15°C
(60°F)		 14°C
(57°F)		 12°C
(54°F)
Average high 8°C
(47°F)		 8°C
(46°F)		 8°C
(47°F)		 9°C
(48°F)		 11°C
(52°F)		 13°C
(56°F)		 15°C
(58°F)		 15°C
(60°F)		 15°C
(59°F)		 13°C
(55°F)		 10°C
(51°F)		 9°C
(49°F)
Daily mean 7°C
(45°F)		 7°C
(44°F)		 7°C
(45°F)		 8°C
(47°F)		 10°C
(50°F)		 12°C
(54°F)		 14°C
(57°F)		 14°C
(58°F)		 14°C
(57°F)		 12°C
(53°F)		 9°C
(49°F)		 8°C
(46°F)
Average low 6°C
(43°F)		 5°C
(42°F)		 6°C
(42°F)		 7°C
(45°F)		 9°C
(49°F)		 11°C
(52°F)		 13°C
(56°F)		 13°C
(56°F)		 13°C
(55°F)		 11°C
(51°F)		 9°C
(48°F)		 7°C
(44°F)
Mean minimum 2°C
(37°F)		 2°C
(36°F)		 3°C
(37°F)		 4°C
(39°F)		 6°C
(44°F)		 9°C
(49°F)		 11°C
(52°F)		 12°C
(53°F)		 10°C
(51°F)		 8°C
(46°F)		 6°C
(43°F)		 4°C
(39°F)
Minimum 2°C
(36°F)		 1°C
(34°F)		 -1°C
(31°F)		 2°C
(36°F)		 5°C
(41°F)		 8°C
(47°F)		 11°C
(52°F)		 11°C
(52°F)		 9°C
(49°F)		 5°C
(42°F)		 4°C
(40°F)		 2°C
(35°F)

Compare climate in Castlerock with other places

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

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

Castlerock usually has the most precipitation in October, November and December, with an average of 23 rainy days and 161 mm (6.3 inches) of precipitation per month.The driest months in Castlerock are April, May and June. On average, 77 mm (3.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Castlerock, 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) 109 (4.3) 132 (5.2) 112 (4.4) 55 (2.2) 72 (2.9) 105 (4.1) 110 (4.3) 146 (5.7) 117 (4.6) 161 (6.3) 156 (6.2) 166 (6.5)
Average precipitation days (≥ 1 mm) 17 18 18 12 13 17 17 20 20 24 23 23

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

The sunniest months in Castlerock are May, June and July, when the sun shines an average of 13 hours 0 minutes a day.Least sunny months in Castlerock: January, November and December receive an average of 2 hours 56 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Castlerock, 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 72 145 206 319 404 388 403 357 283 223 116 81
Mean daily daylight hours 7h 49m 9h 40m 11h 53m 14h 10m 16h 11m 17h 17m 16h 41m 14h 51m 12h 39m 10h 24m 8h 21m 7h 13m

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

Castlerock experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 6 - 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 Castlerock UV Index data.

Average daily maximum UV levels by month for Castlerock, 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 3 5 6 8 8 6 5 3 2 1