Snowdonia National Park Weather in December

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

Considering a trip to Snowdonia National Park, the United Kingdom this December and wondering about the expected weather conditions? Find all the crucial information you need right here, addressing your question:

What to Expect in Snowdonia National Park in December

Snowdonia National Park, the United Kingdom is a region in the United Kingdom. December in Snowdonia National Park generally has cold temperatures, with precipitation levels ranging from high to heavy. December is a winter month.

Temperatures

You can expect cold maximum daytime temperatures of around 8°C (46°F) and nighttime temperatures around 3°C (37°F) in Betws-y-coed.

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

Precipitation

In December, precipitation varies across different areas. From high rainfall in Trefriw with an average of 118 mm (4.6 in) to heavy rainfall in Beddgelert with 165 mm (6.5 in). Looking at the climate data spanning the last 30 years, this month sees the heaviest rainfall of the year in Betws-y-coed.

Average sunshine

Sunshine is more restricted in many locations in December. Betws-y-coed sees roughly 26 hours of sunlight. Our weather planner can help you find destinations with more sunshine if needed.

Explore Snowdonia National Park by month

Pick a month to see the average temperature, rainfall and sunshine in Snowdonia National Park - and find the best time to visit. (based on Betws-y-coed)

Best Places to Visit in Snowdonia National Park in December

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

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 Snowdonia National Park

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

Temperature range in Snowdonia National Park (December)

Precipitation variation in Snowdonia National Park (December)

Betws-y-coed

In December Betws-y-coed generally has low temperatures with maximum daytime temperatures around 8°C (46°F), minimum nighttime temperatures around 3°C (37°F) and high monthly rainfall. So on average the conditions are less favorable that month.

November
December
January
Max temperature
10°C (50°F)
8°C (46°F)
8°C (46°F)
Min temperature
5°C (41°F)
3°C (37°F)
2°C (36°F)
Monthly sun hours
42 hours
26 hours
33 hours
Monthly rainfall
117 mm (4.6 in)
124 mm (4.9 in)
110 mm (4.3 in)
Monthly rainy days
21 days
21 days
22 days
Weather conditions

Dolgellau

In December Dolgellau generally has low temperatures with maximum daytime temperatures around 8°C (46°F), minimum nighttime temperatures around 3°C (37°F) and high monthly rainfall. So on average the conditions are less favorable that month.

November
December
January
Max temperature
11°C (52°F)
8°C (46°F)
8°C (46°F)
Min temperature
5°C (41°F)
3°C (37°F)
3°C (37°F)
Monthly sun hours
42 hours
26 hours
33 hours
Monthly rainfall
138 mm (5.4 in)
151 mm (5.9 in)
134 mm (5.3 in)
Monthly rainy days
21 days
21 days
22 days
Weather conditions

Blaenau-Ffestiniog

In December Blaenau-Ffestiniog generally has low temperatures with maximum daytime temperatures around 8°C (46°F), minimum nighttime temperatures around 3°C (37°F) and high monthly rainfall. So on average the conditions are less favorable that month.

November
December
January
Max temperature
10°C (50°F)
8°C (46°F)
8°C (46°F)
Min temperature
5°C (41°F)
3°C (37°F)
2°C (36°F)
Monthly sun hours
42 hours
26 hours
33 hours
Monthly rainfall
140 mm (5.5 in)
150 mm (5.9 in)
135 mm (5.3 in)
Monthly rainy days
21 days
22 days
22 days
Weather conditions

Beddgelert

In December Beddgelert generally has low temperatures with maximum daytime temperatures around 9°C (48°F), minimum nighttime temperatures around 4°C (39°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)
8°C (46°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
158 mm (6.2 in)
165 mm (6.5 in)
146 mm (5.7 in)
Monthly rainy days
21 days
21 days
22 days
Weather conditions

Dolwyddelan

In December Dolwyddelan generally has low temperatures with maximum daytime temperatures around 8°C (46°F), minimum nighttime temperatures around 3°C (37°F) and high monthly rainfall. So on average the conditions are less favorable that month.

November
December
January
Max temperature
10°C (50°F)
8°C (46°F)
8°C (46°F)
Min temperature
5°C (41°F)
3°C (37°F)
2°C (36°F)
Monthly sun hours
42 hours
26 hours
33 hours
Monthly rainfall
129 mm (5.1 in)
137 mm (5.4 in)
122 mm (4.8 in)
Monthly rainy days
21 days
22 days
22 days
Weather conditions

Is your destination not in the list? Have a look at all destinations in Snowdonia National Park, 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 Snowdonia National Park in December.

City Weather Day temp Night temp Rainfall
Betws-y-coed 8°C (46°F) 3°C (37°F) 124 mm (4.9 in)
Dolgellau 8°C (46°F) 3°C (37°F) 151 mm (5.9 in)
Blaenau-Ffestiniog 8°C (46°F) 3°C (37°F) 150 mm (5.9 in)
Beddgelert 9°C (48°F) 4°C (39°F) 165 mm (6.5 in)
Dolwyddelan 8°C (46°F) 3°C (37°F) 137 mm (5.4 in)
Llanberis 9°C (48°F) 4°C (39°F) 142 mm (5.6 in)

Snowdonia National Park weather in December: frequently asked questions

What is the weather like in Snowdonia National Park, the United Kingdom in December?

In December, Snowdonia National Park, the United Kingdom generally has less favorable weather conditions. Betws-y-coed sees daytime temperatures near 8°C (46°F), with nights cooling to roughly 3°C (37°F).

What is the average temperature in Snowdonia National Park, the United Kingdom in December?

Daytime temperatures in Betws-y-coed peak at roughly 8°C (46°F) in December, dropping to about 3°C (37°F) overnight.

Does Snowdonia National Park, the United Kingdom get a lot of rain in December?

Betws-y-coed typically receives notable rainfall in December, about 124 mm (4.9 in) on average across Snowdonia National Park, the United Kingdom.

Is December a Good Time to Visit Snowdonia National Park, the United Kingdom?

In our view, December might not be the best time to travel to Snowdonia National Park, the United Kingdom with often less favorable weather in Betws-y-coed.

Generally speaking, June and July provide very good weather in Betws-y-coed. 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 Snowdonia National Park.

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.

Bucket list

Need travel inspiration? Check out our bucket list articles and be inspired.