Belfast
United Kingdom
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Belfast, United Kingdom

A close-up view of the Northern Ireland City Hall located in Belfast, United Kingdom
A close-up view of the Northern Ireland City Hall located in Belfast, United Kingdom
December, the first month of the winter, in Belfast, is still a chilly month, with average temperature varying between 7.4°C (45.3°F) and 2.1°C (35.8°F).

Temperature

In December, the average high-temperature is essentially the same as in November - a still frosty 7.4°C (45.3°F). The average low-temperature, in December, is 2.1°C (35.8°F).

Rainfall

In Belfast, in December, during 14 rainfall days, 79.3mm (3.1") of precipitation is typically accumulated. In Belfast, during the entire year, the rain falls for 157.5 days and collects up to 860.2mm (33.9") of precipitation.

Sea temperature

In Belfast, the average seawater temperature is 10.5°C (50.9°F).
Note: Swimming in 10.5°C (50.9°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

December has the shortest days of the year, with an average of 7.4h of daylight.

Sunshine

December has the least sunshine of the year in Belfast, United Kingdom, with an average of 1.5h of sunshine.

UV index

January and December, with an average maximum UV index of 0, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low threat to health from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: In December, the average maximum UV index of 0 translate into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in December in Belfast?

In Belfast, United Kingdom, in December, the average high-temperature is 7.4°C (45.3°F), and the average low-temperature is 2.1°C (35.8°F).

How many days does it rain in December in Belfast?

In Belfast, United Kingdom, during December, the rain falls for 14 days and regularly aggregates up to 79.3mm (3.1") of precipitation.

What is the sea water temperature in December in Belfast?

In December, the average sea temperature in Belfast is 10.5°C (50.9°F). Swimming in 10.5°C (50.9°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation.

What is the month with the shortest days in Belfast?

With an average of 7.4h of daylight, December has the shortest days of the year in Belfast, United Kingdom.

What is the average length of the day in December in Belfast?

The average length of the day in December in Belfast is 7.4h.

What is the month with the least sunshine in Belfast?

December has the least sunshine of the year, with an average of 1.5h of sunshine.

How many hours of sunshine does Belfast have in December?

The average sunshine in December in Belfast is 1.5h.

When is the lowest UV index in Belfast?

Months with the lowest UV index in Belfast, United Kingdom, are January and December, with an average maximum UV index of 0.

What is the UV index reading in December in Belfast?

The average daily maximum UV index in December in Belfast, United Kingdom, is 0. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to the UV radiation.
Average temperature in December - Belfast, United Kingdom
  • Average high temperature in December: 7.4°C

The warmest month (with the highest average high temperature) is July (18.8°C).
The month with the lowest average high temperature is January (7.1°C).

  • Average low temperature in December: 2.1°C

The month with the highest average low temperature is July (11.7°C).
The coldest month (with the lowest average low temperature) is February (1.6°C).

Average rainfall in December - Belfast, United Kingdom
  • Average rainfall in December: 79.3mm

The wettest month (with the highest rainfall) is October (89.6mm).
The driest month (with the lowest rainfall) is May (57.3mm).

Average rainfall days in December - Belfast, United Kingdom
  • Average rainfall days in December: 14 days

The month with the highest number of rainy days is January (14.8 days).
The month with the lowest number of rainy days is June (11.3 days).

Average sea temperature in December - Belfast, United Kingdom
  • Average sea temperature in December: 10.5°C

The best month for swimming (with the highest average sea temperature) is September (14.3°C).
The coldest month (with the lowest average sea temperature) is March (8°C).

Average daylight in December / Average sunshine in December - Belfast, United Kingdom
  • Average daylight in December: 7.4h

The month with the longest days is June (Average daylight: 17.2h).
The month with shortest days is December (Average daylight: 7.4h).

  • Average sunshine in December: 1.5h

The month with most sunshine is May (Average sunshine: 6.4h).
The month with least sunshine is December (Average sunshine: 1.5h).

Average UV index in December - Belfast, United Kingdom
  • Average UV index in December: 0

Months with the highest UV index are June and July (UV index 6).
Months with the lowest UV index are January and December (UV index 0).