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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 6°C (43°F). Expect temperature extremes ranging from a biting -12°C (10°F) to a mild 22°C (71°F). This month brings 135 mm (5.3 in) of precipitation spread over 10 days, coupled with a high average humidity of 88%. Be prepared for a mix of chilly and wet weather!

December Temperature in London

In December, in London, the average temperature is 6°C (43°F), with maximums reaching up to 22°C (71°F) and minimums dropping as low as -12°C (10°F). Be prepared for a wide range of temperatures and pack accordingly for your trip!

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 6°C (43°F), with highs reaching up to 22°C (71°F) and lows dropping to around -12°C (10°F).
JanFebMarAprMayJunJulAugSepOctNovDec374349576773787571614642
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 total precipitation amount is 135 mm (5.3 in) recorded over a span 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 135 mm (5.3 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec9817913413412614110912310712076135
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 88%. With an average temperature of 6°C (43°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable and prompting you to seek warm shelter frequently.

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 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%87%84%84%83%79%66%67%76%89%88%
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.
JanFebMarAprMayJunJulAugSepOctNovDec3679111111109753
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 Weather3°C (38°F)98 mm (3.9 inches)88%moderate
February Weather6°C (43°F)179 mm (7.0 inches)88%high
March Weather10°C (49°F)134 mm (5.3 inches)87%high
April Weather14°C (57°F)134 mm (5.3 inches)84%very high
May Weather20°C (67°F)126 mm (5.0 inches)84%extreme
June Weather23°C (73°F)141 mm (5.5 inches)83%extreme
July Weather25°C (78°F)109 mm (4.3 inches)79%extreme
August Weather24°C (76°F)123 mm (4.8 inches)66%very high
September Weather22°C (72°F)107 mm (4.2 inches)67%very high
October Weather16°C (61°F)120 mm (4.7 inches)76%high
November Weather8°C (46°F)76 mm (3.0 inches)89%moderate
December Weather6°C (43°F)135 mm (5.3 inches)88%moderate

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