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December Weather in Mullan, United States

Last updated: June 24, 2025

In December, the average temperature in Mullan, United States hovers around -3°C (28°F). However, don't be surprised if the thermometer dips as low as -23°C (-9°F) or peaks at 13°C (56°F). Expect a precipitation total of 136 mm (5.4 in) spread over 18 days, accompanied by a high average humidity of 90%. Be prepared for a chilly and wet experience!

December Temperature in Mullan

In December in Mullan, the average temperature is -3°C (28°F), with maximums reaching 13°C (56°F) and minimums plummeting to as low as -23°C (-9°F). Travelers should be prepared for a wide range of temperatures and dress in layers to stay comfortable.

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

The chart illustrates December temperature patterns in Mullan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mullan, December typically has an average temperature of -3°C (28°F), with highs reaching up to 13°C (56°F) and lows dropping to around -23°C (-9°F).
JanFebMarAprMayJunJulAugSepOctNovDec262333405158686756423427
Data source: Temperature data for Mullan 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 Mullan

In Mullan in December, the total precipitation amount is 136 mm (5.4 in) spread over 18 days.

December Precipitation Trends in Mullan

The chart displays monthly precipitation patterns in Mullan, 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 Mullan, December typically receives around 136 mm (5.4 inches) of precipitation spread over approximately 18 days.
JanFebMarAprMayJunJulAugSepOctNovDec112151991029054122648108138136
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Mullan

In Mullan in December humidity is 90%. With an average temperature of -3°C (28°F), this humidity feels like an icy fog wrapping around you, making outdoor activities uncomfortable and potentially dangerous for traveling.

December Average Humidity in Mullan

This chart illustrates the average monthly humidity levels in Mullan, 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 Mullan is approximately 90%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%89%87%84%78%78%77%64%62%79%87%90%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Mullan

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

Maximum UV Index Levels in Mullan for December

The chart shows the monthly maximum UV Index (UVI) for Mullan 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 Mullan typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2467991097532
Data source: Mullan 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 Mullan Compares to Other Months

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

This table compares monthly weather conditions in Mullan, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (26°F)112 mm (4.4 inches)89%low
February Weather-5°C (24°F)151 mm (5.9 inches)89%moderate
March Weather0°C (33°F)99 mm (3.9 inches)87%high
April Weather4°C (40°F)102 mm (4.0 inches)84%high
May Weather10°C (51°F)90 mm (3.5 inches)77%very high
June Weather15°C (59°F)54 mm (2.1 inches)78%very high
July Weather20°C (68°F)12 mm (0.5 inches)77%very high
August Weather19°C (67°F)26 mm (1.0 inches)64%very high
September Weather13°C (56°F)48 mm (1.9 inches)62%high
October Weather5°C (42°F)108 mm (4.3 inches)79%moderate
November Weather1°C (34°F)138 mm (5.4 inches)87%moderate
December Weather-3°C (28°F)136 mm (5.4 inches)90%low

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