Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average sea temperature in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
December
Weather in December
Temperature
The arrival of December is marked by an average high-temperature of a still frosty 6.6°C (43.9°F), bearing a close resemblance to November. Porthmadog's nights in December maintain a consistent average of 3°C (37.4°F), demonstrating a minimal differential from its daytime temperature.Humidity
The months with the highest humidity in Porthmadog are January and December, with an average relative humidity of 91%.Rainfall
December is the month with the most rainfall. Rain falls for 20.8 days and accumulates 103mm (4.06") of precipitation.Snowfall
Months with snowfall in Porthmadog are January through April, November and December. In December, in Porthmadog, it is snowing for 3.9 days. Throughout December, 46mm (1.81") of snow is accumulated. In Porthmadog, during the entire year, snow falls for 22.5 days and aggregates up to 260mm (10.24") of snow.Sea temperature
In Porthmadog, in December, the average water temperature is 10.8°C (51.4°F).Note: Swimming in 10.8°C (51.4°F) can be lethal. Merely spending a few minutes in 13°C (55.4°F) waters feels harsh, and venturing below 10°C (50°F) might disrupt breathing control and bring about cold shock, contingent on individual resilience.
Daylight
The month with the shortest days is December, with an average of 7h and 42min of daylight.On the first day of the month, sunrise is at 8:07 am and sunset at 4:04 pm. On the last day of December, sunrise is at 8:29 am and sunset at 4:10 pm GMT.
Sunshine
The month with the least sunshine in Porthmadog is December, with an average of 2.5h of sunshine.UV index
The months with the lowest UV index in Porthmadog are January through April, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index of 2 in December interprets into the following recommendations:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold does it get in Porthmadog in December?
What are the most humid months in Porthmadog?
What is the average humidity in December in Porthmadog?
What is the rainiest month in Porthmadog?
How much does it rain in Porthmadog in December?
How much does it snow in Porthmadog in December?
What is the sea water temperature in December in Porthmadog?
What is the month with the shortest days in Porthmadog?
What is the average length of the day in December in Porthmadog?
When is the sunrise / sunset in December in Porthmadog?
What is the month with the least sunshine in Porthmadog?
How many hours of sunshine does Porthmadog have in December?
What are the months with the lowest UV index in Porthmadog?
What is the UV index intensity in December in Porthmadog?
Average temperature in December
Porthmadog, United Kingdom
- Average high temperature in December: 6.6°C
The warmest month (with the highest average high temperature) is July (17.2°C).
The month with the lowest average high temperature is January (5.6°C).
- Average low temperature in December: 3°C
The month with the highest average low temperature is August (10.6°C).
The coldest month (with the lowest average low temperature) is February (1.5°C).
Average pressure in December
Porthmadog, United Kingdom
- Average pressure in December: 1012.3mbar
The month with the highest atmospheric pressure is May (1016.3mbar).
The month with the lowest atmospheric pressure is November (1009.1mbar).
Average wind speed in December
Porthmadog, United Kingdom
- Average wind speed in December: 17.8km/h
The windiest month (with the highest average wind speed) is December (17.8km/h).
The calmest month (with the lowest average wind speed) is June (11.2km/h).
Average humidity in December
Porthmadog, United Kingdom
- Average humidity in December: 91%
The months with the highest relative humidity are January and December (91%).
The months with the lowest relative humidity are April and May (84%).
Average rainfall in December
Porthmadog, United Kingdom
- Average rainfall in December: 103mm
The wettest month (with the highest rainfall) is December (103mm).
The driest months (with the least rainfall) are April and May (52mm).
Average rainfall days in December
Porthmadog, United Kingdom
- Average rainfall days in December: 20.8 days
The month with the highest number of rainy days is August (22.4 days).
The month with the least rainy days is February (15.3 days).
Average snowfall in December
Porthmadog, United Kingdom
- Average snowfall in December: 46mm
The month with the highest snowfall is January (70mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in December
Porthmadog, United Kingdom
- Average snowfall days in December: 3.9 days
The month with the highest number of snowfall days is February (6.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in December
Porthmadog, United Kingdom
- Average sea temperature in December: 10.8°C
The best month for swimming (with the highest average sea temperature) is September (15.7°C).
The coldest months (with the lowest average sea temperature) are February and March (8.3°C).
Average daylight in December /
Average sunshine in December
Porthmadog, United Kingdom
- Average daylight in December: 7h and 4min
The month with the longest days is June (Average daylight: 16h and 48min).
The month with the shortest days is December (Average daylight: 7h and 42min).
- Average sunshine in December: 2h and 3min
The months with the most sunshine are May and June (Average sunshine: 6h and 12min).
The month with the least sunshine is December (Average sunshine: 2h and 30min).
Average sunshine days in December
Porthmadog, United Kingdom
- Average sunshine days in December: 6.5 days
The month with the most sunshine days is March (10.8 days).
The month with the least sunshine days is August (5.9 days).
Average UV index in December
Porthmadog, United Kingdom
- Average UV index in December: 2
The months with the highest UV index are May, June and August (UV index 4).
The months with the lowest UV index are January, February, March, April, November and December (UV index 2).
Average cloud cover in December
Porthmadog, United Kingdom
- Average cloud cover in December: 76
The month with the most cloud cover is December (Cloud cover 76).
The month with the least cloud cover is April (Cloud cover 60).
Average visibility in December
Porthmadog, United Kingdom
- Average visibility in December: 8km
The months with the highest visibility are January, February, March, April, May, June, July, October, November and December (8km).
The months with the lowest visibility are August and September (7km).
