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December Weather in Thompson Falls, United States

Last updated: June 24, 2025

In December, the average temperature in Thompson Falls, United States hovers around -3°C (27°F), with minimums dipping as low as -22°C (-8°F) and occasional highs reaching 13°C (56°F). Expect 107 mm (4.2 in) of precipitation over approximately 17 days, accompanied by a high average humidity level of 90%.

December Temperature in Thompson Falls

In December in Thompson Falls, the average temperature is -3°C (27°F). Maximum temperatures can reach 13°C (56°F), while minimums can drop as low as -22°C (-8°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

December Weather in Thompson Falls: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Thompson Falls, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Thompson Falls, December typically has an average temperature of -3°C (27°F), with highs reaching up to 13°C (56°F) and lows dropping to around -22°C (-8°F).
JanFebMarAprMayJunJulAugSepOctNovDec252232395058676655413327
Data source: Temperature data for Thompson Falls 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 Thompson Falls

In Thompson Falls in December, the precipitation amount is 107 mm (4.2 in) and occurs over 17 days.

December Precipitation Trends in Thompson Falls

The chart displays monthly precipitation patterns in Thompson Falls, 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 Thompson Falls, December typically receives around 107 mm (4.2 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec851268089855918264292109107
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Thompson Falls

In Thompson Falls in December humidity is 90%. With an average temperature of -3°C (27°F), this humidity feels like a bitter chill that seeps into your bones, making travel uncomfortable and necessitating extra layers to combat both the cold and the dampness in the air.

December Average Humidity in Thompson Falls

This chart illustrates the average monthly humidity levels in Thompson Falls, 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 Thompson Falls 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 Thompson Falls

In Thompson Falls 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 Thompson Falls, you can visit Hourly UV Index in Thompson Falls.

Maximum UV Index Levels in Thompson Falls for December

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

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

This table compares monthly weather conditions in Thompson Falls, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)85 mm (3.4 inches)89%low
February Weather-6°C (22°F)126 mm (5.0 inches)89%moderate
March Weather0°C (32°F)80 mm (3.1 inches)87%high
April Weather4°C (39°F)89 mm (3.5 inches)84%high
May Weather10°C (50°F)85 mm (3.4 inches)77%very high
June Weather14°C (58°F)59 mm (2.3 inches)78%very high
July Weather20°C (67°F)18 mm (0.7 inches)77%very high
August Weather19°C (66°F)26 mm (1.0 inches)64%very high
September Weather13°C (55°F)42 mm (1.6 inches)62%high
October Weather5°C (41°F)92 mm (3.6 inches)79%moderate
November Weather0°C (33°F)109 mm (4.3 inches)87%moderate
December Weather-3°C (27°F)107 mm (4.2 inches)90%low

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