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December Weather in Sioux Lookout, Canada

Last updated: June 18, 2025

In December, the average temperature in Sioux Lookout, Canada hovers around -12°C (10°F), with extremes reaching a chilling -34°C (-29°F) at the low end and a maximum of 6°C (42°F). Expect 38 mm (1.5 in) of precipitation spread over 9 days, coupled with a damp average humidity of 96%. Prepare for a cold and wet month!

December Temperature in Sioux Lookout

In December in Sioux Lookout, the average temperature is -12°C (10°F). Maximums can reach 6°C (42°F), while minimums can drop to as low as -34°C (-29°F). Travelers should be prepared for extremely cold weather conditions during this time.

December Weather in Sioux Lookout: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Sioux Lookout, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sioux Lookout, December typically has an average temperature of -12°C (10°F), with highs reaching up to 6°C (42°F) and lows dropping to around -34°C (-29°F).
JanFebMarAprMayJunJulAugSepOctNovDec5421324963686454402210
Data source: Temperature data for Sioux Lookout 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 Sioux Lookout

In Sioux Lookout in December, the total precipitation amount is 38 mm (1.5 in) spread over a duration of 9 days.

December Precipitation Trends in Sioux Lookout

The chart displays monthly precipitation patterns in Sioux Lookout, 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 Sioux Lookout, December typically receives around 38 mm (1.5 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec25302546638410486133834038
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Sioux Lookout

In Sioux Lookout in December humidity is 96%. With an average temperature of -12°C (10°F), this humidity feels like a biting chill that clings to your skin, making outdoor adventures feel much colder than the thermometer suggests.

December Average Humidity in Sioux Lookout

This chart illustrates the average monthly humidity levels in Sioux Lookout, 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 Sioux Lookout is approximately 96%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec96%96%93%90%75%66%62%67%73%82%90%96%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Sioux Lookout

In Sioux Lookout 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 Sioux Lookout.

Maximum UV Index Levels in Sioux Lookout for December

The chart shows the monthly maximum UV Index (UVI) for Sioux Lookout 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 Sioux Lookout typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235789876421
Data source: Sioux Lookout 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 Sioux Lookout Compares to Other Months

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

This table compares monthly weather conditions in Sioux Lookout, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-15°C (5°F)25 mm (1.0 inches)96%low
February Weather-15°C (4°F)30 mm (1.2 inches)96%moderate
March Weather-6°C (22°F)25 mm (1.0 inches)93%moderate
April Weather0°C (33°F)46 mm (1.8 inches)90%high
May Weather10°C (50°F)63 mm (2.5 inches)75%very high
June Weather17°C (64°F)84 mm (3.3 inches)66%very high
July Weather20°C (68°F)104 mm (4.1 inches)62%very high
August Weather18°C (65°F)86 mm (3.4 inches)67%high
September Weather12°C (54°F)133 mm (5.2 inches)73%high
October Weather5°C (41°F)82 mm (3.2 inches)82%moderate
November Weather-6°C (22°F)40 mm (1.6 inches)90%low
December Weather-12°C (10°F)38 mm (1.5 inches)96%low

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