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December Weather in Post Falls, United States

Last updated: June 24, 2025

In December, the average temperature in Post Falls, United States hovers around 0°C (32°F). However, be prepared for a wide range—thermometers can plummet to a chilling -16°C (3°F), or rise to a comfortable 16°C (61°F). Expect about 95 mm (3.8 in) of precipitation over roughly 14 days, accompanied by a rather high average humidity of 90%. Be sure to dress warmly and make the most of the season!

December Temperature in Post Falls

In December in Post Falls, the average temperature is 0°C (32°F). Maximum temperatures can reach 16°C (61°F) and the minimum can drop as low as -16°C (3°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

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

The chart illustrates December temperature patterns in Post Falls, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Post Falls, December typically has an average temperature of 0°C (32°F), with highs reaching up to 16°C (61°F) and lows dropping to around -16°C (3°F).
JanFebMarAprMayJunJulAugSepOctNovDec302938465664737261473832
Data source: Temperature data for Post 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 Post Falls

In Post Falls in December, the precipitation amount is 95 mm (3.8 in) over the course of 14 days.

December Precipitation Trends in Post Falls

The chart displays monthly precipitation patterns in Post 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 Post Falls, December typically receives around 95 mm (3.8 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec928876726030613427410396
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Post Falls

In Post Falls in December, humidity is 90%. With an average temperature of 0°C (32°F), this humidity feels like an icy grip on your skin, making the air feel heavy and damp, which can turn traveling into a chilling experience where every step is met with a bone-cold embrace.

December Average Humidity in Post Falls

This chart illustrates the average monthly humidity levels in Post 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 Post 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 Post Falls

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

Maximum UV Index Levels in Post Falls for December

The chart shows the monthly maximum UV Index (UVI) for Post 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 Post Falls typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2456891097532
Data source: Post 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 Post Falls Compares to Other Months

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

This table compares monthly weather conditions in Post Falls, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)92 mm (3.6 inches)89%low
February Weather-1°C (30°F)88 mm (3.4 inches)89%moderate
March Weather3°C (38°F)76 mm (3.0 inches)87%moderate
April Weather8°C (46°F)72 mm (2.8 inches)84%high
May Weather13°C (56°F)60 mm (2.3 inches)77%very high
June Weather18°C (65°F)30 mm (1.2 inches)78%very high
July Weather23°C (73°F)5 mm (0.2 inches)77%very high
August Weather22°C (72°F)13 mm (0.5 inches)64%very high
September Weather16°C (61°F)42 mm (1.6 inches)62%high
October Weather8°C (47°F)74 mm (2.9 inches)79%moderate
November Weather3°C (38°F)103 mm (4.1 inches)87%moderate
December Weather0°C (32°F)95 mm (3.8 inches)90%low

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