Cardiff
United Kingdom
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Cardiff, United Kingdom

December, the first month of the winter, in Cardiff, is still a chilly month, with average temperature ranging between max 8.7°C (47.7°F) and min 2.6°C (36.7°F).

Temperature

In Cardiff, the average high-temperature in December is essentially the same as in November - a chilly 8.7°C (47.7°F). The average low-temperature, in Cardiff, United Kingdom, is 2.6°C (36.7°F).

Rainfall

In Cardiff, during 13.9 rainfall days, 125.3mm (4.9") of precipitation is typically accumulated. In Cardiff, during the entire year, the rain falls for 148.8 days and collects up to 1152.1mm (45.4") of precipitation.

Sea temperature

In Cardiff, United Kingdom, the average seawater temperature is 11.5°C (52.7°F).
Note: 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.

Daylight

With an average of 7.9h of daylight, December has the shortest days of the year.

Sunshine

The month with the least sunshine in Cardiff is December, with an average of 1.6h of sunshine.

UV index

With an average maximum UV index of 0, December is the month with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health vulnerability from the 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in December in Cardiff?

In Cardiff, in December, the average high-temperature is 8.7°C (47.7°F), and the average low-temperature is 2.6°C (36.7°F).

How many days does it rain in December in Cardiff?

In Cardiff, during December, the rain falls for 13.9 days and regularly aggregates up to 125.3mm (4.9") of precipitation.

What is the water temperature in December in Cardiff?

In December, the average sea temperature is 11.5°C (52.7°F). Swimming in 11.5°C (52.7°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

What is the month with the shortest days in Cardiff?

December has the shortest days of the year in Cardiff, United Kingdom, with an average of 7.9h of daylight.

How many hours of daylight does Cardiff have in December?

The average length of the day in December in Cardiff is 7.9h.

What is the month with the least sunshine in Cardiff?

December has the least sunshine of the year in Cardiff, with an average of 1.6h of sunshine.

How long on average sun shines in December in Cardiff?

In Cardiff, the average sunshine in December is 1.6h.

What is the month with the lowest UV index in Cardiff?

The month with the lowest UV index in Cardiff, United Kingdom, is December, with an average maximum UV index of 0.

What is the UV index reading in December in Cardiff?

The average daily maximum UV index in December in Cardiff is 0. A UV Index of 2, and less, symbolizes a minimal health vulnerability from the exposure to the Sun's UV radiation.
Average temperature in December - Cardiff, United Kingdom
  • Average high temperature in December: 8.7°C

The warmest month (with the highest average high temperature) is July (21.7°C).
The month with the lowest average high temperature is January (8.3°C).

  • Average low temperature in December: 2.6°C

The month with the highest average low temperature is July (13.1°C).
The coldest month (with the lowest average low temperature) is February (2.1°C).

Average rainfall in December - Cardiff, United Kingdom
  • Average rainfall in December: 125.3mm

The wettest month (with the highest rainfall) is October (133.5mm).
The driest month (with the lowest rainfall) is June (66.6mm).

Average rainfall days in December - Cardiff, United Kingdom
  • Average rainfall days in December: 13.9 days

The month with the highest number of rainy days is January (15.7 days).
The month with the lowest number of rainy days is June (10.1 days).

Average sea temperature in December - Cardiff, United Kingdom
  • Average sea temperature in December: 11.5°C

Best months for swimming (with the highest average sea temperature) are August and September (16.6°C).
The coldest month (with the lowest average sea temperature) is March (8.7°C).

Average daylight in December / Average sunshine in December - Cardiff, United Kingdom
  • Average daylight in December: 7.9h

The month with the longest days is June (Average daylight: 16.5h).
The month with shortest days is December (Average daylight: 7.9h).

  • Average sunshine in December: 1.6h

The month with most sunshine is July (Average sunshine: 6.4h).
The month with least sunshine is December (Average sunshine: 1.6h).

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

Months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 0).