December Weather in Wellesley, Canada

Last updated: June 18, 2025

In December, the average temperature in Wellesley, Canada hovers around -2°C (29°F). Expect a chilly range with minimum temperatures dipping to -25°C (-12°F) and highs reaching up to 15°C (59°F). The region experiences about 77 mm (3.0 in) of precipitation spread over 14 days, accompanied by a notable average humidity of 87%.

December Temperature in Wellesley

In December in Wellesley, the average temperature is -2°C (29°F), with a maximum that can reach 15°C (59°F) and a minimum that can drop as low as -25°C (-12°F). Travelers should be prepared for a wide range of temperatures, from chilly days to potentially frigid nights.

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

The chart illustrates December temperature patterns in Wellesley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Wellesley, December typically has an average temperature of -2°C (29°F), with highs reaching up to 15°C (59°F) and lows dropping to around -25°C (-12°F).

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

December Precipitation in Wellesley

In Wellesley in December, the precipitation amount is 77 mm (3.0 in) over the course of 14 days.

December Precipitation Trends in Wellesley

The chart displays monthly precipitation patterns in Wellesley, 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 Wellesley, December typically receives around 77 mm (3.0 inches) of precipitation spread over approximately 14 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 Wellesley

In Wellesley in December humidity is 87%. With an average temperature of -2°C (29°F), this humidity feels like an uncomfortable chill that seeps into your bones, making it challenging to enjoy outdoor activities.

December Average Humidity in Wellesley

This chart illustrates the average monthly humidity levels in Wellesley, 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 Wellesley 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 Wellesley

In Wellesley 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 Wellesley, you can visit Hourly UV Index in Wellesley.

Maximum UV Index Levels in Wellesley for December

The chart shows the monthly maximum UV Index (UVI) for Wellesley 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 Wellesley typically reaches 2, which falls under the low exposure category.

Data source: Wellesley 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 Wellesley Compares to Other Months

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

This table compares monthly weather conditions in Wellesley, 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 (22°F)	77 mm (3.0 inches)	90%	low
February Weather	-5°C (23°F)	81 mm (3.2 inches)	90%	moderate
March Weather	0°C (31°F)	70 mm (2.8 inches)	87%	moderate
April Weather	5°C (42°F)	101 mm (4.0 inches)	87%	very high
May Weather	13°C (55°F)	98 mm (3.9 inches)	82%	very high
June Weather	18°C (65°F)	108 mm (4.2 inches)	81%	very high
July Weather	21°C (70°F)	79 mm (3.1 inches)	79%	very high
August Weather	20°C (68°F)	102 mm (4.0 inches)	80%	very high
September Weather	16°C (61°F)	83 mm (3.3 inches)	81%	high
October Weather	10°C (50°F)	111 mm (4.4 inches)	84%	moderate
November Weather	2°C (36°F)	89 mm (3.5 inches)	88%	moderate
December Weather	-2°C (29°F)	77 mm (3.0 inches)	87%	low