December Weather in London, United States

Last updated: June 24, 2025

In December, the average temperature in London, United States hovers around 8°C (46°F). However, be prepared for a range, as temperatures can dip to a chilly -7°C (19°F) or soar to a warm 26°C (80°F). During this time, expect around 100 mm (3.9 in) of precipitation spread over 8 days, coupled with an average humidity of 87%. Whether you're exploring the outdoors or cozying up indoors, this month offers a diverse weather experience!

December Temperature in London

In December in London, the average temperature is 8°C (46°F). Maximum temperatures can reach 26°C (80°F), while minimums can drop as low as -7°C (19°F). Be prepared for a wide range of weather conditions if you're traveling during this time.

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 8°C (46°F), with highs reaching up to 26°C (80°F) and lows dropping to around -7°C (19°F).

Data source: Temperature data for London generated using information from the Copernicus Climate Change Service.

December Precipitation in London

In London in December, the precipitation amount is 100 mm (3.9 in) spread over the course of 8 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 100 mm (3.9 inches) of precipitation spread over approximately 8 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

December Humidity in London

In London in December, humidity is 87%. With an average temperature of 8°C (46°F), this humidity feels like a chilly, damp fog clinging to your skin, making outdoor activities a bit uncomfortable and causing even mild exertion to leave you feeling clammy and cold.

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.

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 reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in London for better planning.

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 4, which falls under the moderate exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (41°F)	88 mm (3.4 inches)	82%	moderate
February Weather	7°C (44°F)	135 mm (5.3 inches)	79%	high
March Weather	12°C (54°F)	140 mm (5.5 inches)	77%	very high
April Weather	15°C (60°F)	150 mm (5.9 inches)	78%	very high
May Weather	21°C (70°F)	198 mm (7.8 inches)	82%	very high
June Weather	26°C (78°F)	122 mm (4.8 inches)	81%	extreme
July Weather	27°C (82°F)	86 mm (3.4 inches)	75%	extreme
August Weather	26°C (80°F)	127 mm (5.0 inches)	61%	very high
September Weather	24°C (76°F)	65 mm (2.6 inches)	59%	very high
October Weather	17°C (64°F)	103 mm (4.1 inches)	69%	high
November Weather	10°C (51°F)	88 mm (3.4 inches)	82%	moderate
December Weather	8°C (46°F)	100 mm (3.9 inches)	87%	moderate