December Weather in Castlegar, Canada

Last updated: June 18, 2025

In December, the average temperature in Castlegar, Canada hovers around -6°C (22°F). However, temperatures can dip as low as -27°C (-17°F), while peaking at a milder 9°C (48°F). Expect a precipitation amount of 114 mm (4.5 in) over about 16 days, complemented by an average humidity of a brisk 93%.

December Temperature in Castlegar

In December in Castlegar, the average temperature is -6°C (22°F). Maximum temperatures can reach 9°C (48°F), while minimums can drop to as low as -27°C (-17°F). Be prepared for cold weather and dress warmly if you plan to travel during this time.

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

The chart illustrates December temperature patterns in Castlegar, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castlegar, December typically has an average temperature of -6°C (22°F), with highs reaching up to 9°C (48°F) and lows dropping to around -27°C (-17°F).

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

December Precipitation in Castlegar

In Castlegar in December, the precipitation amount is 114 mm (4.5 in), occurring over a span of 16 days.

December Precipitation Trends in Castlegar

The chart displays monthly precipitation patterns in Castlegar, 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 Castlegar, December typically receives around 114 mm (4.5 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 Castlegar

In Castlegar in December humidity is 93%. With an average temperature of -6°C (22°F), this humidity feels like a biting chill that seeps into your bones, making travel uncomfortable as the damp air clings to your clothing and slows your movements.

December Average Humidity in Castlegar

This chart illustrates the average monthly humidity levels in Castlegar, 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 Castlegar is approximately 93%, 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 Castlegar

In Castlegar in December, the maximum UV index is 1, which corresponds to a low Exposure Category. This means you have a time to burn of 45 minutes. For more details, you can check the Hourly UV Index in Castlegar.

Maximum UV Index Levels in Castlegar for December

The chart shows the monthly maximum UV Index (UVI) for Castlegar 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 Castlegar typically reaches 1, which falls under the low exposure category.

Data source: Castlegar 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 Castlegar Compares to Other Months

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

This table compares monthly weather conditions in Castlegar, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (21°F)	100 mm (4.0 inches)	90%	low
February Weather	-6°C (21°F)	88 mm (3.5 inches)	91%	moderate
March Weather	0°C (32°F)	101 mm (4.0 inches)	89%	moderate
April Weather	4°C (39°F)	92 mm (3.6 inches)	85%	high
May Weather	10°C (50°F)	78 mm (3.1 inches)	82%	very high
June Weather	14°C (58°F)	70 mm (2.8 inches)	81%	very high
July Weather	19°C (66°F)	32 mm (1.3 inches)	84%	very high
August Weather	18°C (65°F)	37 mm (1.5 inches)	75%	very high
September Weather	12°C (54°F)	69 mm (2.7 inches)	74%	high
October Weather	4°C (40°F)	92 mm (3.6 inches)	85%	moderate
November Weather	-1°C (31°F)	118 mm (4.6 inches)	88%	low
December Weather	-6°C (22°F)	114 mm (4.5 inches)	93%	low