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December Weather in Fort St. John, Canada

Last updated: June 18, 2025

In Fort St. John, Canada, the average temperature in December hovers around -10°C (15°F), but it can plummet to a chilling -40°C (-39°F) or rise to a mild 8°C (46°F). Expect 22 mm (0.9 in) of precipitation spread over 5 days, along with a high average humidity of 95%. Bundle up and prepare for the elements!

December Temperature in Fort St. John

In December in Fort St. John, the average temperature is -10°C (15°F). The maximum can reach 8°C (46°F), while the minimum can drop to as low as -40°C (-39°F). Be prepared for extreme cold and dress warmly if you plan to travel during this time.

December Weather in Fort St. John: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Fort St. John, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fort St. John, December typically has an average temperature of -10°C (15°F), with highs reaching up to 8°C (46°F) and lows dropping to around -40°C (-39°F).
JanFebMarAprMayJunJulAugSepOctNovDec12921355158615949362114
Data source: Temperature data for Fort St. John generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Fort St. John

In Fort St. John in December, the total precipitation amount is 22 mm (0.9 in) spread over a period of 5 days.

December Precipitation Trends in Fort St. John

The chart displays monthly precipitation patterns in Fort St. John, 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 Fort St. John, December typically receives around 22 mm (0.9 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec262632274181935546415022
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Fort St. John

In Fort St. John in December, humidity is 95%. With an average temperature of -10°C (15°F), this humidity feels like a biting chill that penetrates your clothes, making outdoor activities uncomfortable and travel less enjoyable.

December Average Humidity in Fort St. John

This chart illustrates the average monthly humidity levels in Fort St. John, 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 Fort St. John is approximately 95%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec94%94%89%86%82%80%83%80%83%87%91%95%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Fort St. John

In Fort St. John 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 Fort St. John.

Maximum UV Index Levels in Fort St. John for December

The chart shows the monthly maximum UV Index (UVI) for Fort St. John 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 Fort St. John typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123577775311
Data source: Fort St. John 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 Fort St. John Compares to Other Months

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

This table compares monthly weather conditions in Fort St. John, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-11°C (12°F)26 mm (1.0 inches)94%low
February Weather-13°C (9°F)26 mm (1.0 inches)94%low
March Weather-6°C (22°F)31 mm (1.2 inches)89%moderate
April Weather2°C (35°F)27 mm (1.1 inches)86%moderate
May Weather10°C (51°F)41 mm (1.6 inches)82%high
June Weather15°C (59°F)81 mm (3.2 inches)80%high
July Weather16°C (61°F)93 mm (3.7 inches)83%high
August Weather15°C (59°F)55 mm (2.2 inches)80%high
September Weather9°C (49°F)46 mm (1.8 inches)83%moderate
October Weather2°C (37°F)41 mm (1.6 inches)86%moderate
November Weather-6°C (21°F)50 mm (2.0 inches)91%low
December Weather-10°C (15°F)22 mm (0.9 inches)95%low

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