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December Weather in London, United States

Last updated: June 24, 2025

In London, United States, the average temperature in December hovers around 2°C (36°F), making it a chilly time of year. Temperatures can swing dramatically, with a minimum of -17°C (1°F) and a maximum reaching up to 18°C (65°F). Be prepared for a wet month, as you'll encounter approximately 95 mm (3.8 in) of precipitation over about 10 days. Additionally, the air can feel quite damp with an average humidity of 87%.

December Temperature in London

In December in London, the average temperature is 2°C (36°F). The maximum can reach 18°C (65°F), and the minimum can be as low as -17°C (1°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

December Weather in London: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in London, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In London, December typically has an average temperature of 2°C (36°F), with highs reaching up to 18°C (65°F) and lows dropping to around -17°C (1°F).
JanFebMarAprMayJunJulAugSepOctNovDec303342526371757368574136
Data source: Temperature data for London generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in London

In London in December, the precipitation amount is 95 mm (3.8 in) over the course of 10 days.

December Precipitation Trends in London

The chart displays monthly precipitation patterns in London, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In London, December typically receives around 95 mm (3.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec751041081111311341219994959595
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in London

In London in December, humidity is 87%. With an average temperature of 2°C (36°F), this humidity feels like an unwelcome chill that seeps into your bones, making outdoor exploration feel damp and heavy, and encouraging travelers to seek the warmth of indoor attractions instead.

December Average Humidity in London

This chart illustrates the average monthly humidity levels in London, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in London is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%87%85%81%82%81%73%73%78%89%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in London

In London in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in London, you can check the information here.

Maximum UV Index Levels in London for December

The chart shows the monthly maximum UV Index (UVI) for London in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in London typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098643
Data source: London December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in London Compares to Other Months

Weather in London varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in London, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in London, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)75 mm (3.0 inches)88%moderate
February Weather1°C (34°F)104 mm (4.1 inches)88%moderate
March Weather6°C (42°F)108 mm (4.2 inches)87%high
April Weather11°C (52°F)111 mm (4.4 inches)85%very high
May Weather17°C (64°F)131 mm (5.1 inches)81%very high
June Weather22°C (72°F)134 mm (5.3 inches)82%very high
July Weather24°C (75°F)120 mm (4.7 inches)81%very high
August Weather23°C (73°F)99 mm (3.9 inches)73%very high
September Weather20°C (69°F)94 mm (3.7 inches)73%very high
October Weather14°C (58°F)95 mm (3.7 inches)78%high
November Weather5°C (42°F)95 mm (3.7 inches)89%moderate
December Weather2°C (36°F)95 mm (3.8 inches)87%moderate

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