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December Weather in Granby, Canada

Last updated: June 18, 2025

In December, the average temperature in Granby, Canada hovers around -5°C (24°F), with extreme fluctuations where temperatures can dip as low as -27°C (-17°F) or rise to a pleasant 16°C (61°F). Expect 85 mm (3.3 in) of precipitation spread out over 13 days, contributing to an average humidity of 89% for a distinctly chilly atmosphere.

December Temperature in Granby

In December in Granby, the average temperature is -5°C (24°F), with maximums reaching 16°C (61°F) and minimums dropping as low as -27°C (-17°F). Travelers should prepare for a wide range of temperatures and dress in layers to stay comfortable during their visit.

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

The chart illustrates December temperature patterns in Granby, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Granby, December typically has an average temperature of -5°C (24°F), with highs reaching up to 16°C (61°F) and lows dropping to around -27°C (-17°F).
JanFebMarAprMayJunJulAugSepOctNovDec182028425665706860493424
Data source: Temperature data for Granby 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 Granby

In Granby in December, the precipitation amount is 85 mm (3.3 in) spread over 13 days.

December Precipitation Trends in Granby

The chart displays monthly precipitation patterns in Granby, 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 Granby, December typically receives around 85 mm (3.3 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec9184871171021171111156914112285
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Granby

In Granby in December humidity is 89%. With an average temperature of -5°C (24°F), this humidity feels like an uncomfortable chill enveloping you, making outdoor activities less enjoyable and requiring extra layers to stay warm while battling the dampness in the air.

December Average Humidity in Granby

This chart illustrates the average monthly humidity levels in Granby, 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 Granby is approximately 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%92%86%85%80%74%76%75%78%86%89%89%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Granby

In Granby 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 Granby, you can visit Hourly UV Index in Granby.

Maximum UV Index Levels in Granby for December

The chart shows the monthly maximum UV Index (UVI) for Granby 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 Granby typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec245899887532
Data source: Granby 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 Granby Compares to Other Months

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

This table compares monthly weather conditions in Granby, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (18°F)91 mm (3.6 inches)93%low
February Weather-7°C (20°F)84 mm (3.3 inches)92%moderate
March Weather-2°C (29°F)87 mm (3.4 inches)86%moderate
April Weather6°C (43°F)117 mm (4.6 inches)85%very high
May Weather13°C (56°F)102 mm (4.0 inches)80%very high
June Weather18°C (65°F)117 mm (4.6 inches)74%very high
July Weather21°C (70°F)111 mm (4.4 inches)76%very high
August Weather20°C (68°F)115 mm (4.5 inches)75%very high
September Weather16°C (60°F)69 mm (2.7 inches)78%high
October Weather10°C (49°F)141 mm (5.5 inches)86%moderate
November Weather1°C (34°F)122 mm (4.8 inches)88%moderate
December Weather-5°C (24°F)85 mm (3.3 inches)89%low

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