Weather in December
December brings the onset of winter in Alderney, noticeable through the significant drop in daylight hours. Alderney receives the least amount of daylight for the year in this month, playing host to just 8.2 hours. The frigid sea temperature further confirms winter’s arrival, falling to a brisk 12°C (53.6°F). December presents a stark contrast to the earlier sunny months, ending the year with the coolest temperatures and shortest days.
Note: Unprotected swimming in 12°C (53.6°F) is dangerous due to potential cold shock. Especially when temperatures go below 10°C (50°F), leading to hyperventilation.
On the first day of December, sunrise is at 07:44 and sunset at 16:11. On the last day of the month, sunrise is at 08:05 and sunset at 16:18 GMT.
Sea temperature
In Alderney, the average seawater temperature in December is 12°C (53.6°F).Note: Unprotected swimming in 12°C (53.6°F) is dangerous due to potential cold shock. Especially when temperatures go below 10°C (50°F), leading to hyperventilation.
Daylight
With an average of 8h and 12min of daylight, December has the shortest days of the year in Alderney.On the first day of December, sunrise is at 07:44 and sunset at 16:11. On the last day of the month, sunrise is at 08:05 and sunset at 16:18 GMT.
Updated: Jun 5, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the sea water temperature in December?
In December, the average sea temperature is 12°C (53.6°F). At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 13°C (55.4°F) is not comfortable.
What is the month with the shortest days?
The month with the shortest days is December, with an average of 8h and 12min of daylight.
What is the average length of the day in December in Alderney?
The average day length in December is 8h and 13min.
What time are sunrise and sunset in December?
On the first day of December, sunrise is at 07:44 and sunset at 16:11. On the last day of the month, sunrise is at 08:05 and sunset at 16:18 GMT.
Average sea temperature in December
Alderney, Guernsey
- Average sea temperature in December: 12°C
The best month for swimming (with the highest average sea temperature) is September (17.4°C).
The coldest month (with the lowest average sea temperature) is March (9.3°C).
Average daylight in December
Alderney, Guernsey
- Average daylight in December: 8h and 1min
The month with the longest days is June (Average daylight: 16h and 12min).
The month with the shortest days is December (Average daylight: 8h and 12min).
Alderney, Guernsey
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