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December Weather in Rupert, United States

Last updated: June 24, 2025

In Rupert, United States, the average temperature in December hovers around -3°C (27°F). Expect chilling lows of -27°C (-17°F) and mild highs reaching 14°C (58°F). During this month, precipitation is notable, with around 101 mm (4.0 in) spread over 12 days, while the average humidity lingers at a damp 84%.

December Temperature in Rupert

In December in Rupert, the average temperature is -3°C (27°F). The maximum can reach 14°C (58°F) and the minimum can be as low as -27°C (-17°F). Travelers should be prepared for a wide range of temperatures and dress accordingly to enjoy their trip.

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

The chart illustrates December temperature patterns in Rupert, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rupert, December typically has an average temperature of -3°C (27°F), with highs reaching up to 14°C (58°F) and lows dropping to around -27°C (-17°F).
JanFebMarAprMayJunJulAugSepOctNovDec222532445765716962513627
Data source: Temperature data for Rupert 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 Rupert

In Rupert in December, the precipitation amount is 101 mm (4.0 in) spread over 12 days.

December Precipitation Trends in Rupert

The chart displays monthly precipitation patterns in Rupert, 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 Rupert, December typically receives around 101 mm (4.0 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec83938112796861209285147109101
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Rupert

In Rupert in December humidity is 84%. With an average temperature of -3°C (27°F), this humidity feels like a heavy blanket that wraps around you, making travel uncomfortable and your breath visible in the cold air.

December Average Humidity in Rupert

This chart illustrates the average monthly humidity levels in Rupert, 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 Rupert is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%88%86%84%76%72%67%64%72%81%87%85%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Rupert

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

Maximum UV Index Levels in Rupert for December

The chart shows the monthly maximum UV Index (UVI) for Rupert 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 Rupert typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3468910997632
Data source: Rupert 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 Rupert Compares to Other Months

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

This table compares monthly weather conditions in Rupert, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)83 mm (3.3 inches)89%moderate
February Weather-4°C (25°F)93 mm (3.7 inches)88%moderate
March Weather0°C (32°F)81 mm (3.2 inches)86%high
April Weather7°C (44°F)127 mm (5.0 inches)84%very high
May Weather14°C (57°F)96 mm (3.8 inches)76%very high
June Weather19°C (66°F)86 mm (3.4 inches)72%very high
July Weather22°C (71°F)120 mm (4.7 inches)66%very high
August Weather21°C (69°F)92 mm (3.6 inches)64%very high
September Weather17°C (62°F)84 mm (3.3 inches)72%high
October Weather10°C (51°F)147 mm (5.8 inches)81%high
November Weather2°C (36°F)109 mm (4.3 inches)87%moderate
December Weather-3°C (27°F)101 mm (4.0 inches)84%low

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