December Weather in London, Canada

Last updated: June 18, 2025

In December, the average temperature in London, Canada hovers around 0°C (31°F). Expect minimums to dip as low as -20°C (-3°F), while highs can reach up to 16°C (60°F). During this period, precipitation totals around 72 mm (2.8 in) across approximately 13 days, and the humidity lingers at a notable 87%. Stay prepared for a blend of chilly and wet conditions!

December Temperature in London

In December in London, the average temperature is 0°C (31°F), with maximums reaching 16°C (60°F) and minimums dipping as low as -20°C (-3°F). Be sure to pack accordingly for a range of temperatures while 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 0°C (31°F), with highs reaching up to 16°C (60°F) and lows dropping to around -20°C (-3°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 72 mm (2.8 in) over a period of 13 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 72 mm (2.8 inches) of precipitation spread over approximately 13 days.

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

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Millimeters (mm) Inches (in)

December Humidity in London

In London in December, humidity is 87%. With an average temperature of 0°C (31°F), this humidity feels like a heavy, damp blanket enveloping you, making travel feel excessively chilly and uncomfortable, as the cold penetrates through your layers and the wet air clings to your skin.

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 is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in London, you can visit Hourly UV Index in London.

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 2, which falls under the low 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	-4°C (25°F)	74 mm (2.9 inches)	90%	low
February Weather	-3°C (26°F)	78 mm (3.1 inches)	90%	moderate
March Weather	1°C (34°F)	78 mm (3.1 inches)	87%	moderate
April Weather	7°C (44°F)	105 mm (4.1 inches)	87%	very high
May Weather	14°C (57°F)	104 mm (4.1 inches)	82%	very high
June Weather	19°C (67°F)	105 mm (4.1 inches)	81%	very high
July Weather	22°C (72°F)	97 mm (3.8 inches)	79%	very high
August Weather	21°C (70°F)	108 mm (4.2 inches)	80%	very high
September Weather	17°C (64°F)	86 mm (3.4 inches)	81%	very high
October Weather	11°C (53°F)	124 mm (4.9 inches)	84%	moderate
November Weather	3°C (38°F)	91 mm (3.6 inches)	88%	moderate
December Weather	0°C (31°F)	72 mm (2.8 inches)	87%	low