December Weather in South River, Canada

Last updated: June 18, 2025

In December, the average temperature in South River, Canada hovers around -6°C (21°F). Expect a chilly range, as temperatures can dip to a minimum of -32°C (-25°F) and soar to a maximum of 15°C (58°F). With 86 mm (3.4 in) of precipitation spread across 16 days, the atmosphere is quite humid, boasting an average humidity level of 91%. Stay warm and prepared for the damp conditions!

December Temperature in South River

In December in South River, the average temperature is -6°C (21°F). The maximum can reach 15°C (58°F) and the minimum can be as low as -32°C (-25°F). Travelers should prepare for a wide range of temperatures and pack accordingly for both cold and warmer conditions.

December Weather in South River: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in South River, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South River, December typically has an average temperature of -6°C (21°F), with highs reaching up to 15°C (58°F) and lows dropping to around -32°C (-25°F).

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

December Precipitation in South River

In South River in December, the precipitation amount is 86 mm (3.4 in) over a period of 16 days.

December Precipitation Trends in South River

The chart displays monthly precipitation patterns in South River, 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 South River, December typically receives around 86 mm (3.4 inches) of precipitation spread over approximately 16 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 South River

In South River in December humidity is 91%. With an average temperature of -6°C (21°F), this humidity feels like wandering through a cold, damp fog that clings to your skin, making it challenging to stay warm and comfortable while exploring the surroundings.

December Average Humidity in South River

This chart illustrates the average monthly humidity levels in South River, 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 South River is approximately 91%, 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 South River

In South River 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 South River, you can visit Hourly UV Index in South River.

Maximum UV Index Levels in South River for December

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

Data source: South River 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 South River Compares to Other Months

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

This table compares monthly weather conditions in South River, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-10°C (15°F)	65 mm (2.6 inches)	93%	low
February Weather	-9°C (17°F)	78 mm (3.1 inches)	94%	moderate
March Weather	-4°C (25°F)	63 mm (2.5 inches)	87%	moderate
April Weather	4°C (39°F)	107 mm (4.2 inches)	82%	high
May Weather	11°C (53°F)	106 mm (4.2 inches)	74%	very high
June Weather	16°C (62°F)	126 mm (5.0 inches)	68%	very high
July Weather	20°C (68°F)	108 mm (4.3 inches)	67%	very high
August Weather	18°C (65°F)	133 mm (5.3 inches)	67%	very high
September Weather	14°C (57°F)	133 mm (5.2 inches)	74%	high
October Weather	8°C (46°F)	116 mm (4.5 inches)	83%	moderate
November Weather	-1°C (31°F)	100 mm (4.0 inches)	89%	moderate
December Weather	-6°C (21°F)	86 mm (3.4 inches)	91%	low