December weather forecastPlymouth, United Kingdom

Weather in December

As the year winds down, December registers a palpable shift in Plymouth's weather, with the mercury dipping further to 9.5°C (49.1°F). The contrast from the warmth of summer is definitive, announcing the arrival of the holiday season. Short daylight hours combined with cold temperatures induce a sense of calmness and joyous expectation. The city lights up with festive decorations, radiating warmth amid chilly winds. An aura of festive cheer wraps up the weather of this year-end month.

Temperature

Plymouth's shift from November to December is accompanied by an average high-temperature of a chilly 9.5°C (49.1°F), a slight deviation from 11.8°C (53.2°F). Plymouth's evenings during December maintain an average temperature of 4.5°C (40.1°F), aligning closely with the daytime temperatures.

Rainfall

December is the month with the most rainfall. Rain falls for 14.5 days and accumulates 119mm (4.69") of precipitation.

Sea temperature

In Plymouth, the average seawater temperature in December is 11.9°C (53.4°F).
Note: With the appropriate swimsuit, one can swim in 11.9°C (53.4°F) even if temperatures dip below 10°C (50°F); otherwise, be ready for cold shock and breath issues. A fleeting swim around 13°C (55.4°F) is distressing.

Daylight

The month with the shortest days in Plymouth is December, with an average of 8h and 6min of daylight.
On the first day of the month, sunrise is at 7:55 am and sunset at 4:16 pm. On the last day of December, sunrise is at 8:16 am and sunset at 4:22 pm GMT.

Sunshine

The month with the least sunshine is December, with an average of 1.8h of sunshine.

UV index

January, February, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Plymouth. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for the average person.
Note: The maximum UV index of 1 during December translates into these guidelines:
Protection from prolonged sun exposure is necessary for babies, children, and individuals with sensitive skin. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.