Castlerock Weather in December

Castlerock in December sees low daytime temperatures of 10°C (50°F) and nighttime lows of 5°C (41°F). Rainfall is fairly high this month at around 139 mm (5.5 in), so pack a rain jacket to stay dry.

Rainfall in Castlerock in December

Typically around 22 days of rainfall are expected, averaging 139 mm (5.5 in) for the month. This is a wet month with frequent and often heavy showers. Both the number of rain days and the total rainfall are high.

Temperature in Castlerock in December

Castlerock in December gets highs of 10°C (50°F) during the day and drops to 5°C (41°F) at night. Expect a cold feel throughout the day, not just in the mornings and evenings. Warm layers are essential. Nights fall to 5°C (41°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.

Sunshine in Castlerock in December

The city usually sees around 39 hours of sunlight, indicating fewer sunny days.

December in Castlerock has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations in the world.

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Check the conditions for any month of the year.

• January
• February
• March
• April

• May
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• August

• September
• October
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• December

For a detailed overview over the year and the best time to visit the United Kingdom, check out our Castlerock's climate page.

Castlerock Temperature in December

Min Temperature 5°C (41°F)  

Max Temperature 10°C (50°F)  

Chance of Rain 74%  

Precipitation 139 mm (5.5 in)  

Rainy days 22 days  

Sunshine 39 hours *  

Percentage Sunshine *  

* Data from: Derry, Ireland (38 KM, 23 Miles).

What to Wear in Castlerock in December

Cold weather calls for smart layering in December. A thermal base layer makes a huge difference in staying warm. Add a wool sweater or fleece, then a wind-resistant outer jacket. Prepare for significant rainfall with proper waterproof clothing and shoes. With limited sunshine expected, sunglasses aren't a priority for packing.

What To Do in Castlerock in December

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

4/10

Cycling

4/10

Walking

4/10

Camping

3/10

Outdoor sports

4/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United Kingdom, check out our Castlerock's climate page.

More climate data for Castlerock

Temperature Rainfall Sunshine

See the full Castlerock climate overview or explore weather in the United Kingdom.