Sea Temperature in Castlerock in December

Complete information on the sea temperature range in the Irish Sea in Castlerock in December. Historical daily data. Climate details for December. Tips on swimming conditions and beach relaxation in Castlerock. We find every spot where you can swim and tell you what the water temperature is there today and throughout the year.

Water Temperature Range in Castlerock in December

48°F

MINIMUN

52°F

AVERAGE

55°F

MAXIMUM

Historical Data of Water Temperature in December in Castlerock

Water Temperature Chart for Irish Sea in Castlerock in December

Sea Temperature Table in Castlerock in December Over the Past Years

Day	2024	2023	2022	Average
Dec 1	52°C	54°C	54°C	53°C
Dec 2	54°C	54°C	54°C	53°C
Dec 3	54°C	54°C	54°C	53°C
Dec 4	52°C	54°C	54°C	53°C
Dec 5	52°C	54°C	54°C	53°C
Dec 6	54°C	54°C	54°C	53°C
Dec 7	52°C	52°C	54°C	52°C
Dec 8	52°C	52°C	52°C	52°C
Dec 9	52°C	52°C	52°C	52°C
Dec 10	52°C	52°C	52°C	52°C
Dec 11	52°C	52°C	54°C	52°C
Dec 12	52°C	54°C	54°C	52°C
Dec 13	52°C	52°C	52°C	51°C
Dec 14	50°C	52°C	52°C	51°C
Dec 15	50°C	52°C	52°C	51°C
Dec 16	50°C	50°C	52°C	51°C
Dec 17	48°C	50°C	52°C	51°C
Dec 18	50°C	50°C	52°C	51°C
Dec 19	50°C	50°C	52°C	51°C
Dec 20	50°C	50°C	52°C	51°C
Dec 21	50°C	52°C	52°C	51°C
Dec 22	50°C	50°C	52°C	51°C
Dec 23	48°C	50°C	52°C	50°C
Dec 24	48°C	50°C	50°C	50°C
Dec 25	48°C	50°C	50°C	50°C
Dec 26	48°C	52°C	50°C	50°C
Dec 27	48°C	52°C	52°C	51°C
Dec 28	48°C	52°C	52°C	51°C
Dec 29	48°C	52°C	50°C	50°C
Dec 30	48°C	52°C	50°C	50°C

Castlerock Climate and Swimming Opportunities in December

46°F

Average Day Air Temperature

37°F

Average Night Air Temperature

5 in

Precipitation Amount per Month

18 days

Number of Rainy Days

7 hrs

Daylight
per Day

1 hrs

Sunshine
per Day

12 mph

Average Wind Speed

91%

Average
humidity

Castlerock lies within the Northen Ireland in United Kingdom. The average daytime temperature in Castlerock in December is 8°C (46°F), while the nighttime average is 3°C (37°F). There are typically 18 rainy days during the month, with a total precipitation of 121 mm (4.8 inches). The daylight duration in December in Castlerock is 7 hours, with an average of 1 hours of sunshine per day. The average wind speed in December is 20 km/h (12 mph), and the humidity level is around 91%.

The water temperature in Castlerock in December ranges from 9°C to 11°C (48°F to 52°F). At the beginning of the month, the average temperature is around 12°C (54°F), shifting to 11°C (52°F) by mid-December and reaching 10°C (50°F) in the last ten days. Overall, the average sea temperature in Castlerock for December is 11°C (52°F). The water is still cold, but for short swims, it can be manageable. Warm clothes are necessary after swimming.

Sea Temperature in December in Nearby Cities

Frequently Asked Questions About Water Temperatures in December in Castlerock

What is the sea temperature in Castlerock in December?

The water temperature in the Irish Sea in Castlerock in December ranges from 9°C to 11°C (48°F to 52°F).

Is it possible to swim in the Irish Sea in Castlerock in December?

The average sea temperature in Castlerock in December is 11°C (52°F), and the air temperature is 8°C (46°F), so the water is still cold, but for short swims, it can be manageable. Warm clothes are necessary after swimming.