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December Weather in Brilliant, United States

Last updated: June 24, 2025

In December, the average temperature in Brilliant, United States hovers around 9°C (49°F), with extremes ranging from a chilly -6°C (21°F) to a warm 24°C (75°F). Expect precipitation of about 155 mm (6.1 in) over 12 days, and be prepared for an average humidity of 88%, creating a cool and moist atmosphere.

December Temperature in Brilliant

In December in Brilliant, the average temperature is 9°C (49°F). Maximum temperatures can reach 24°C (75°F), while minimums can drop as low as -6°C (21°F). Be prepared for a wide range of temperatures when traveling, so pack accordingly!

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

The chart illustrates December temperature patterns in Brilliant, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Brilliant, December typically has an average temperature of 9°C (49°F), with highs reaching up to 24°C (75°F) and lows dropping to around -6°C (21°F).
JanFebMarAprMayJunJulAugSepOctNovDec455057627277808076665248
Data source: Temperature data for Brilliant 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 Brilliant

In Brilliant in December, the total precipitation amount reaches 155 mm (6.1 in) over the course of 12 days.

December Precipitation Trends in Brilliant

The chart displays monthly precipitation patterns in Brilliant, 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 Brilliant, December typically receives around 155 mm (6.1 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec1221961751711221441121269811173155
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Brilliant

In Brilliant in December, humidity is 88%. With an average temperature of 9°C (49°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable and requiring extra layers to stay warm and dry.

December Average Humidity in Brilliant

This chart illustrates the average monthly humidity levels in Brilliant, 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 Brilliant is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%82%82%82%79%82%77%74%73%85%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Brilliant

In Brilliant 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 Brilliant for better planning.

Maximum UV Index Levels in Brilliant for December

The chart shows the monthly maximum UV Index (UVI) for Brilliant 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 Brilliant typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec47810111111119754
Data source: Brilliant 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 Brilliant Compares to Other Months

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

This table compares monthly weather conditions in Brilliant, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (45°F)121 mm (4.8 inches)85%moderate
February Weather10°C (50°F)195 mm (7.7 inches)84%high
March Weather14°C (57°F)175 mm (6.9 inches)82%very high
April Weather17°C (62°F)171 mm (6.7 inches)82%very high
May Weather22°C (72°F)122 mm (4.8 inches)82%extreme
June Weather25°C (77°F)144 mm (5.7 inches)79%extreme
July Weather27°C (80°F)112 mm (4.4 inches)82%extreme
August Weather26°C (80°F)126 mm (5.0 inches)77%extreme
September Weather24°C (76°F)98 mm (3.9 inches)74%very high
October Weather19°C (66°F)111 mm (4.4 inches)73%high
November Weather11°C (52°F)73 mm (2.9 inches)85%moderate
December Weather9°C (49°F)155 mm (6.1 inches)88%moderate

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