December Weather in Grantsville, United States

Last updated: June 24, 2025

In December, the average temperature in Grantsville, United States hovers around 4°C (40°F). This month can bring a chill with minimum temperatures dropping to -14°C (7°F), while it can rise to a pleasant 20°C (69°F) at times. Expect about 122 mm (4.8 in) of precipitation spread over 12 days, contributing to an average humidity level of 86%. Be prepared for a mix of weather as you explore this captivating destination!

December Temperature in Grantsville

In December in Grantsville, the average temperature is 4°C (40°F). Maximums can reach 20°C (69°F), while minimums can drop as low as -14°C (7°F). Be sure to pack layers to stay comfortable during your travels!

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

The chart illustrates December temperature patterns in Grantsville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grantsville, December typically has an average temperature of 4°C (40°F), with highs reaching up to 20°C (69°F) and lows dropping to around -14°C (7°F).
JanFebMarAprMayJunJulAugSepOctNovDec354046556571767470594540
Data source: Temperature data for Grantsville 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 Grantsville

In Grantsville in December, the precipitation amount is 122 mm (4.8 in) over a span of 12 days.

December Precipitation Trends in Grantsville

The chart displays monthly precipitation patterns in Grantsville, 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 Grantsville, December typically receives around 122 mm (4.8 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec9814211514316017312912010611682122
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Grantsville

In Grantsville in December humidity is 86%. With an average temperature of 4°C (40°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities uncomfortable and travel cumbersome as you navigate through a thick, heavy air that clings to your skin.

December Average Humidity in Grantsville

This chart illustrates the average monthly humidity levels in Grantsville, 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 Grantsville is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%88%87%82%84%82%73%74%81%89%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Grantsville

In Grantsville 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 Grantsville, you can check the information here.

Maximum UV Index Levels in Grantsville for December

The chart shows the monthly maximum UV Index (UVI) for Grantsville 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 Grantsville typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098753
Data source: Grantsville 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 Grantsville Compares to Other Months

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

This table compares monthly weather conditions in Grantsville, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (35°F)98 mm (3.9 inches)88%moderate
February Weather4°C (40°F)142 mm (5.6 inches)88%moderate
March Weather8°C (46°F)115 mm (4.5 inches)88%high
April Weather13°C (55°F)142 mm (5.6 inches)86%very high
May Weather18°C (65°F)160 mm (6.3 inches)82%very high
June Weather22°C (72°F)172 mm (6.8 inches)84%very high
July Weather24°C (76°F)129 mm (5.1 inches)82%very high
August Weather23°C (74°F)120 mm (4.7 inches)73%very high
September Weather21°C (70°F)106 mm (4.2 inches)73%very high
October Weather15°C (60°F)116 mm (4.6 inches)81%high
November Weather7°C (45°F)81 mm (3.2 inches)89%moderate
December Weather4°C (40°F)122 mm (4.8 inches)86%moderate

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