December Weather in Guelph, Canada

Last updated: June 18, 2025

In December, the average temperature in Guelph, Canada hovers around -2°C (29°F). Expect a wide range of conditions, with minimum temperatures dipping as low as -26°C (-14°F) and a pleasant maximum reaching up to 16°C (60°F). Prepare for some wet days, as precipitation averages 72 mm (2.8 in) over about 12 days, all while the air maintains a brisk 87% humidity.

December Temperature in Guelph

In December in Guelph, the average temperature is -2°C (29°F). Maximums can reach 16°C (60°F), while minimums can drop as low as -26°C (-14°F). Travelers should be prepared for a wide range of temperatures, from chilly conditions to milder days, so layering clothing is highly recommended.

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

The chart illustrates December temperature patterns in Guelph, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Guelph, December typically has an average temperature of -2°C (29°F), with highs reaching up to 16°C (60°F) and lows dropping to around -26°C (-14°F).

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

December Precipitation in Guelph

In Guelph in December, the total precipitation amount is 72 mm (2.8 in) over the course of 12 days.

December Precipitation Trends in Guelph

The chart displays monthly precipitation patterns in Guelph, 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 Guelph, December typically receives around 72 mm (2.8 inches) of precipitation spread over approximately 12 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 Guelph

In Guelph 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 Guelph

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

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

Maximum UV Index Levels in Guelph for December

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

Data source: Guelph 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 Guelph Compares to Other Months

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

This table compares monthly weather conditions in Guelph, 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 (23°F)	70 mm (2.8 inches)	90%	low
February Weather	-5°C (24°F)	75 mm (2.9 inches)	90%	moderate
March Weather	0°C (32°F)	65 mm (2.5 inches)	87%	moderate
April Weather	6°C (42°F)	103 mm (4.1 inches)	87%	very high
May Weather	13°C (56°F)	97 mm (3.8 inches)	82%	very high
June Weather	19°C (66°F)	105 mm (4.1 inches)	81%	very high
July Weather	22°C (71°F)	77 mm (3.0 inches)	79%	very high
August Weather	20°C (69°F)	95 mm (3.7 inches)	80%	very high
September Weather	17°C (62°F)	71 mm (2.8 inches)	81%	high
October Weather	10°C (50°F)	101 mm (4.0 inches)	84%	moderate
November Weather	2°C (36°F)	78 mm (3.1 inches)	88%	moderate
December Weather	-2°C (29°F)	72 mm (2.8 inches)	87%	low