December weather forecast and climate
London, United Kingdom

The large Thames river overlooking the Westminster Palace and the Big Ben clock tower in London, United Kingdom
The large Thames river overlooking the Westminster Palace and the Big Ben clock tower in London, United Kingdom

Weather in December

The first month of the winter, December, is still a chilly month in London, United Kingdom, with average temperature ranging between max 7.8°C (46°F) and min 3.5°C (38.3°F).

Temperature

In December, the average high-temperature is practically the same as in November - a frosty 7.8°C (46°F). The average low-temperature, in December, is 3.5°C (38.3°F).

Humidity

The most humid month in London is December, with an average relative humidity of 88%.

Rainfall

In December, the rain falls for 11.1 days. Throughout December, 37mm (1.46") of precipitation is accumulated. In London, during the entire year, the rain falls for 151.7 days and collects up to 370mm (14.57") of precipitation.

Snowfall

Months with snowfall are January through April, November and December. In London, during 1.2 snowfall days, 9mm (0.35") of snow is typically accumulated. Throughout the year, in London, there are 7.7 snowfall days, and 50mm (1.97") of snow is accumulated.

Daylight

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

Sunshine

In London, United Kingdom, the average sunshine in December is 4.2h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in London. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from the exposure to the Sun's UV radiation for the ordinary person.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in December in London?

In London, in December, the average high-temperature is 7.8°C (46°F), and the average low-temperature is 3.5°C (38.3°F).

What is the most humid month in London?

The most humid month in London, United Kingdom, is December, with an average relative humidity of 88%.

What is the average humidity in December in London?

In London, United Kingdom, the average relative humidity in December is 88%.

How many days does it rain in December in London?

In London, during December, the rain falls for 11.1 days and regularly aggregates up to 37mm (1.46") of precipitation.

How many days does it snow in December in London?

In London, United Kingdom, during December, snow falls for 1.2 days and regularly aggregates up to 9mm (0.35") of snow.

What is the month with the shortest days in London?

The month with the shortest days in London is December, with an average of 7.9h of daylight.

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

In London, United Kingdom, the average length of the day in December is 7.9h.

How many hours of sunshine does London have in December?

The average sunshine in December in London, United Kingdom, is 4.2h.

When is the lowest UV index in London?

Months with the lowest UV index in London are January, February, November and December, with an average maximum UV index of 2.

How high is the UV index in December in London?

In London, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low health risk from the exposure to the Sun's UV radiation.

Average temperature in December
London, United Kingdom

Average temperature in December - London, United Kingdom
  • Average high temperature in December: 7.8°C

The warmest month (with the highest average high temperature) is July (22.3°C).
The month with the lowest average high temperature is January (6.8°C).

  • Average low temperature in December: 3.5°C

The month with the highest average low temperature is August (13.8°C).
The coldest month (with the lowest average low temperature) is January (2.2°C).

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Average pressure in December
London, United Kingdom

Average pressure in December - London, United Kingdom
  • Average pressure in December: 1014.5mbar

The month with the highest atmospheric pressure is September (1016.9mbar).
The month with the lowest atmospheric pressure is November (1010.6mbar).

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Average wind speed in December
London, United Kingdom

Average wind speed in December - London, United Kingdom
  • Average wind speed in December: 17km/h

The windiest month (with the highest average wind speed) is February (17.3km/h).
The calmest month (with the lowest average wind speed) is September (12.6km/h).

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Average humidity in December
London, United Kingdom

Average humidity in December - London, United Kingdom
  • Average humidity in December: 88%

The month with the highest relative humidity is December (88%).
The month with the lowest relative humidity is August (72%).

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Average rainfall in December
London, United Kingdom

Average rainfall in December - London, United Kingdom
  • Average rainfall in December: 37mm

The wettest month (with the highest rainfall) is June (45mm).
The driest month (with the least rainfall) is April (22mm).

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Average rainfall days in December
London, United Kingdom

Average rainfall days in December - London, United Kingdom
  • Average rainfall days in December: 11.1 days

The month with the highest number of rainy days is July (16.5 days).
The month with the least rainy days is September (9.8 days).

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Average snowfall in December
London, United Kingdom

Average snowfall in December - London, United Kingdom
  • Average snowfall in December: 9mm

The month with the highest snowfall is February (16mm).
Months with the least snowfall are May, June, July, August, September and October (0mm).

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Average snowfall days in December
London, United Kingdom

Average snowfall days in December - London, United Kingdom
  • Average snowfall days in December: 1.2 days

The month with the highest number of snowfall days is February (2.5 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in December /
Average sunshine in December
London, United Kingdom

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

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

  • Average sunshine in December: 4.2h

The month with the most sunshine is August (Average sunshine: 7.9h).
The month with the least sunshine is February (Average sunshine: 3.6h).

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Average sunshine days in December
London, United Kingdom

Average sunshine days in December - London, United Kingdom
  • Average sunshine days in December: 17.5 days

The month with the most sunshine days is September (18.1 days).
The month with the least sunshine days is June (12.2 days).

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Average UV index in December
London, United Kingdom

Average UV index in December - London, United Kingdom
  • Average UV index in December: 2

Months with the highest UV index are June and July (UV index 5).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in December
London, United Kingdom

Average cloud cover in December - London, United Kingdom
  • Average cloud cover in December: 58

The month with the most cloud cover is February (Cloud cover 61).
The month with the least cloud cover is September (Cloud cover 49).

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Average visibility in December
London, United Kingdom

Average visibility in December - London, United Kingdom
  • Average visibility in December: 9km

Months with the highest visibility are January, February, March, April, May, June, July, August, October and December (9km).
Months with the lowest visibility are September and November (8km).

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