December
Weather in December
Sea temperature
In Portland, United Kingdom, in December, the average water temperature is 11.9°C (53.4°F).Note: Dipping into 11.9°C (53.4°F) below 10°C (50°F) is possible with the right protection; absent that, anticipate cold shock and hampered breathing. Swimming momentarily at 13°C (55.4°F) can be jarring.
Daylight
December has the shortest days of the year, with an average of 8h and 6min of daylight.On the first day of the month, sunrise is at 7:49 am and sunset at 4:08 pm. On the last day of December, in Portland, sunrise is at 8:10 am and sunset at 4:15 pm GMT.
Updated: Feb 8, 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
How cold is the water in December in Portland?
In Portland, the average seawater temperature in December is 11.9°C (53.4°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 in Portland?
December has the shortest days of the year in Portland, United Kingdom, with an average of 8h and 6min of daylight.
What is the average length of the day in December in Portland?
In Portland, the average day length in December is 8h and 5min.
What time are sunrise and sunset in December in Portland?
In December, on the first day of the month, sunrise is at 7:49 am and sunset at 4:08 pm. On the last day of the month, in Portland, United Kingdom, sunrise is at 8:10 am and sunset at 4:15 pm GMT.
Average sea temperature in December
Portland, United Kingdom
- Average sea temperature in December: 11.9°C
The best month for swimming (with the highest average sea temperature) is September (17.1°C).
The coldest month (with the lowest average sea temperature) is March (8.8°C).
Average daylight in December
Portland, United Kingdom
- Average daylight in December: 8h and 1min
The month with the longest days is June (Average daylight: 16h and 24min).
The month with the shortest days is December (Average daylight: 8h and 6min).
