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December Weather in Granby, United States

Last updated: June 24, 2025

In December, the average temperature in Granby, United States hovers around 6°C (42°F), with temperatures ranging from a brisk -12°C (10°F) to a pleasantly warm 24°C (75°F). Precipitation is expected to reach about 49 mm (1.9 in) over 6 days, contributing to an average humidity of 87%. Prepare for a mix of chilly and warm days, along with occasional dampness!

December Temperature in Granby

In December in Granby, the average temperature is 6°C (42°F). Maximums can reach 24°C (75°F) and minimums can drop to as low as -12°C (10°F). Be prepared for a wide range of temperatures if you're planning to travel during this month.

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 6°C (42°F), with highs reaching up to 24°C (75°F) and lows dropping to around -12°C (10°F).
JanFebMarAprMayJunJulAugSepOctNovDec363850566776807773594742
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 49 mm (1.9 in) over the course of 6 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 49 mm (1.9 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec84751451401748589111631466049
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 87%. With an average temperature of 6°C (42°F), this humidity feels like a persistent chill that seeps into your bones, making it uncomfortable for traveling and leaving you longing for warmth at every turn.

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 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%78%76%78%83%83%78%68%64%70%83%87%
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 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Granby, you can check the information here.

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 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710101111109753
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 Weather2°C (36°F)84 mm (3.3 inches)81%moderate
February Weather4°C (39°F)75 mm (2.9 inches)78%high
March Weather10°C (50°F)145 mm (5.7 inches)76%high
April Weather13°C (56°F)139 mm (5.5 inches)78%very high
May Weather19°C (67°F)174 mm (6.9 inches)83%very high
June Weather25°C (77°F)85 mm (3.3 inches)83%extreme
July Weather26°C (80°F)89 mm (3.5 inches)78%extreme
August Weather25°C (77°F)111 mm (4.4 inches)68%very high
September Weather23°C (74°F)63 mm (2.5 inches)64%very high
October Weather15°C (59°F)146 mm (5.8 inches)70%high
November Weather8°C (47°F)60 mm (2.3 inches)83%moderate
December Weather6°C (42°F)49 mm (1.9 inches)87%moderate

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