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December Weather in Grannis, United States

Last updated: June 24, 2025

In Grannis, United States, the average temperature in December hovers around 9°C (48°F). Expect a wide range, with minimums dipping to -5°C (22°F) and maximums soaring up to 25°C (77°F). This month brings about 137 mm (5.4 in) of precipitation over approximately 9 days, contributing to an average humidity level of 87%. Prepare for varying conditions and stay cozy!

December Temperature in Grannis

In December in Grannis, the average temperature is 9°C (48°F). The maximum can reach 25°C (77°F), and the minimum can be as low as -5°C (22°F). Pack layers to ensure comfort during your travels, as temperatures can vary significantly throughout the day.

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

The chart illustrates December temperature patterns in Grannis, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grannis, December typically has an average temperature of 9°C (48°F), with highs reaching up to 25°C (77°F) and lows dropping to around -5°C (22°F).
JanFebMarAprMayJunJulAugSepOctNovDec434656617078818076645248
Data source: Temperature data for Grannis 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 Grannis

In Grannis in December, the total precipitation amount is 137 mm (5.4 in) over the course of 9 days.

December Precipitation Trends in Grannis

The chart displays monthly precipitation patterns in Grannis, 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 Grannis, December typically receives around 137 mm (5.4 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec1071591611941951051021087113183137
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Grannis

In Grannis in December humidity is 87%. With an average temperature of 9°C (48°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration uncomfortable and requiring extra layers and careful planning for any activities.

December Average Humidity in Grannis

This chart illustrates the average monthly humidity levels in Grannis, 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 Grannis is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%79%77%78%82%81%75%61%59%69%82%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Grannis

In Grannis in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Grannis for better planning.

Maximum UV Index Levels in Grannis for December

The chart shows the monthly maximum UV Index (UVI) for Grannis 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 Grannis typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111010854
Data source: Grannis 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 Grannis Compares to Other Months

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

This table compares monthly weather conditions in Grannis, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)107 mm (4.2 inches)82%moderate
February Weather8°C (46°F)159 mm (6.3 inches)79%high
March Weather13°C (56°F)161 mm (6.4 inches)77%very high
April Weather16°C (61°F)194 mm (7.6 inches)78%very high
May Weather21°C (71°F)195 mm (7.7 inches)82%extreme
June Weather26°C (78°F)105 mm (4.1 inches)81%extreme
July Weather27°C (81°F)102 mm (4.0 inches)75%extreme
August Weather27°C (80°F)108 mm (4.3 inches)61%very high
September Weather24°C (76°F)71 mm (2.8 inches)59%very high
October Weather18°C (64°F)131 mm (5.1 inches)69%very high
November Weather11°C (52°F)83 mm (3.3 inches)82%moderate
December Weather9°C (48°F)137 mm (5.4 inches)87%moderate

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