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December Weather in Fort Smith, Canada

Last updated: June 18, 2025

In December, the average temperature in Fort Smith, Canada drops to a chilling -20°C (-3°F). Expect lows reaching a frosty -42°C (-43°F) and highs peaking at a mild 2°C (37°F). During this month, precipitation is around 20 mm (0.8 in) over 5 days, while the average humidity hovers at a staggering 98%. Stay warm and prepare for some wintry conditions!

December Temperature in Fort Smith

In December in Fort Smith, the average temperature is -20°C (-3°F). The maximum can reach 2°C (37°F), while the minimum can drop to as low as -42°C (-43°F). Travelers should be prepared for extreme cold conditions and pack accordingly.

December Weather in Fort Smith: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Fort Smith, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fort Smith, December typically has an average temperature of -20°C (-3°F), with highs reaching up to 2°C (37°F) and lows dropping to around -42°C (-43°F).
JanFebMarAprMayJunJulAugSepOctNovDec-5-7102647606460473412-4
Data source: Temperature data for Fort Smith 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 Smith

In Fort Smith in December, the precipitation amount is 20 mm (0.8 in) over a period of 5 days.

December Precipitation Trends in Fort Smith

The chart displays monthly precipitation patterns in Fort Smith, 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 Smith, December typically receives around 20 mm (0.8 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec221414173266637648313020
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Fort Smith

In Fort Smith in December, humidity is 98%. With an average temperature of -20°C (-3°F), this humidity feels like an eerie and biting chill permeating your clothes, making each breath feel dense and heavy, as if the air itself is thick with frost. Traveling in these conditions demands careful preparation and a sturdy will to embrace the freezing environment.

December Average Humidity in Fort Smith

This chart illustrates the average monthly humidity levels in Fort Smith, 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 Smith is approximately 98%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec96%96%93%82%68%60%73%80%82%90%95%98%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Fort Smith

In Fort Smith 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 Smith.

Maximum UV Index Levels in Fort Smith for December

The chart shows the monthly maximum UV Index (UVI) for Fort Smith 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 Smith typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123456664211
Data source: Fort Smith 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 Smith Compares to Other Months

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

This table compares monthly weather conditions in Fort Smith, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-21°C (-5°F)22 mm (0.8 inches)96%low
February Weather-22°C (-6°F)14 mm (0.5 inches)96%low
March Weather-12°C (10°F)14 mm (0.6 inches)93%moderate
April Weather-3°C (27°F)17 mm (0.7 inches)82%moderate
May Weather8°C (47°F)32 mm (1.3 inches)68%moderate
June Weather16°C (61°F)66 mm (2.6 inches)60%high
July Weather18°C (64°F)63 mm (2.5 inches)73%high
August Weather16°C (60°F)76 mm (3.0 inches)80%high
September Weather9°C (48°F)48 mm (1.9 inches)82%moderate
October Weather1°C (34°F)31 mm (1.2 inches)90%low
November Weather-11°C (12°F)30 mm (1.2 inches)95%low
December Weather-20°C (-3°F)20 mm (0.8 inches)98%low

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