Gwynedd Weather in December

Average temperatures, rainfall, sunshine and the best places to visit in Gwynedd, the United Kingdom in December.

Thinking about venturing to Gwynedd, the United Kingdom this December and curious about the weather conditions to expect? This page holds all the key information you seek, responding to your question:

What to Expect in Gwynedd in December

Gwynedd, the United Kingdom is a region in the United Kingdom. December in Gwynedd generally has cold temperatures, with precipitation levels ranging from high to heavy. December falls during the winter season.

Temperatures

The average maximum temperatures are cold and range from 8°C (46°F) in Llandderfel to 11°C (52°F) in Aberdaron. Nighttime temperatures generally drop to 7°C (45°F) in Aberdaron and 2°C (36°F) in Llandderfel.

For a closer look at conditions across Gwynedd, the United Kingdom, refer to the map below.

Precipitation

In December, precipitation varies across different areas. From high rainfall in Colwyn Bay with an average of 103 mm (4.1 in) to heavy rainfall in Pistyll with 202 mm (8 in). Based on our climate, it is the month with the most precipitation throughout the year in Llandudno.

Average sunshine

Sunshine tends to be more scarce in many locations. Llandudno gets roughly 26 hours of sunlight. For sunnier alternatives, check our weather planner to find destinations with better conditions.

Explore Gwynedd by month

Pick a month to see the average temperature, rainfall and sunshine in Gwynedd - and find the best time to visit. (based on Llandudno)

Best Places to Visit in Gwynedd in December

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Gwynedd.

perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Popular Destinations in Gwynedd

What is the weather like in December for some of the most popular destinations in Gwynedd, the United Kingdom?

Temperature range in Gwynedd (December)

Precipitation variation in Gwynedd (December)

Llandudno

In December Llandudno generally has low temperatures with maximum daytime temperatures around 9°C (48°F), minimum nighttime temperatures around 4°C (39°F) and high monthly rainfall. So on average the conditions are less favorable that month.

November
December
January
Max temperature
11°C (52°F)
9°C (48°F)
9°C (48°F)
Min temperature
6°C (43°F)
4°C (39°F)
4°C (39°F)
Monthly sun hours
42 hours
26 hours
33 hours
Monthly rainfall
109 mm (4.3 in)
111 mm (4.4 in)
92 mm (3.6 in)
Monthly rainy days
20 days
21 days
21 days
Weather conditions

Criccieth

In December Criccieth generally has low temperatures with maximum daytime temperatures around 9°C (48°F), minimum nighttime temperatures around 5°C (41°F) and heavy monthly rainfall. So on average the conditions are less favorable that month.

November
December
January
Max temperature
11°C (52°F)
9°C (48°F)
9°C (48°F)
Min temperature
7°C (45°F)
5°C (41°F)
4°C (39°F)
Monthly sun hours
42 hours
26 hours
33 hours
Monthly rainfall
177 mm (7 in)
181 mm (7.1 in)
157 mm (6.2 in)
Monthly rainy days
21 days
21 days
21 days
Weather conditions

Conwy

In December Conwy generally has low temperatures with maximum daytime temperatures around 9°C (48°F), minimum nighttime temperatures around 4°C (39°F) and high monthly rainfall. So on average the conditions are less favorable that month.

November
December
January
Max temperature
11°C (52°F)
9°C (48°F)
9°C (48°F)
Min temperature
6°C (43°F)
4°C (39°F)
3°C (37°F)
Monthly sun hours
42 hours
26 hours
33 hours
Monthly rainfall
104 mm (4.1 in)
107 mm (4.2 in)
91 mm (3.6 in)
Monthly rainy days
20 days
21 days
21 days
Weather conditions

Holyhead

In December Holyhead generally has low temperatures with maximum daytime temperatures around 11°C (52°F), minimum nighttime temperatures around 6°C (43°F) and high monthly rainfall. So on average the conditions are less favorable that month.

November
December
January
Max temperature
13°C (55°F)
11°C (52°F)
10°C (50°F)
Min temperature
8°C (46°F)
6°C (43°F)
6°C (43°F)
Monthly rainfall
128 mm (5 in)
118 mm (4.6 in)
99 mm (3.9 in)
Monthly rainy days
20 days
20 days
21 days
Weather conditions

Bangor

In December Bangor generally has low temperatures with maximum daytime temperatures around 9°C (48°F), minimum nighttime temperatures around 4°C (39°F) and high monthly rainfall. So on average the conditions are less favorable that month.

November
December
January
Max temperature
11°C (52°F)
9°C (48°F)
9°C (48°F)
Min temperature
6°C (43°F)
4°C (39°F)
3°C (37°F)
Monthly sun hours
42 hours
26 hours
33 hours
Monthly rainfall
116 mm (4.6 in)
117 mm (4.6 in)
102 mm (4 in)
Monthly rainy days
21 days
21 days
21 days
Weather conditions

Is your destination not in the list? Have a look at all destinations in Gwynedd, in the United Kingdom.

In our records: the United Kingdom December extremes

Notable December records observed across cities in the United Kingdom in our climate database (1976 – 2026). Historic readings can vary in quality, so treat these as illustrative.

  • In our records, the coldest December daytime high in the United Kingdom was -10°C (14°F) in Glasgow on December 29, 1995.
  • From our sources, the wettest December day in the United Kingdom brought 301 mm (12 in) in Belfast on December 4, 1982.

Popular cities in December

Day & night temperatures, rainfall and average weather in Gwynedd in December.

City Weather Day temp Night temp Rainfall
Llandudno 9°C (48°F) 4°C (39°F) 111 mm (4.4 in)
Criccieth 9°C (48°F) 5°C (41°F) 181 mm (7.1 in)
Conwy 9°C (48°F) 4°C (39°F) 107 mm (4.2 in)
Holyhead 11°C (52°F) 6°C (43°F) 118 mm (4.6 in)
Bangor 9°C (48°F) 4°C (39°F) 117 mm (4.6 in)
Beaumaris 9°C (48°F) 4°C (39°F) 113 mm (4.4 in)

Gwynedd weather in December: frequently asked questions

What is the weather like in Gwynedd, the United Kingdom in December?

In December, Gwynedd, the United Kingdom generally has less favorable weather conditions. Llandudno sees daytime temperatures near 9°C (48°F), with nights cooling to roughly 4°C (39°F).

What is the average temperature in Gwynedd, the United Kingdom in December?

In Llandudno, the average daytime high in December is 9°C (48°F), while nighttime temperatures drop to around 4°C (39°F).

Does Gwynedd, the United Kingdom get a lot of rain in December?

Llandudno typically receives notable rainfall in December, about 111 mm (4.4 in) on average across Gwynedd, the United Kingdom.

Is December a Good Time to Visit Gwynedd, the United Kingdom?

Given the typically less favorable weather conditions in Llandudno, December may not be the ideal time to visit Gwynedd, the United Kingdom.

On average, the best time to visit Gwynedd, the United Kingdom is in July with generally excellent weather in Llandudno. On the other hand, the weather in January, February, March, November and December tend to be less favorable.

Interested in more climate information?

We have much more information about the climate in Gwynedd.

Weather and climate has detailed information for every country in the world. Are you going to the United Kingdom? Get detailed historical weather averages for many cities in the United Kingdom.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.

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