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December Weather in Cathlamet, United States

Last updated: June 24, 2025

In December, the average temperature in Cathlamet, United States hovers around 5°C (41°F). Expect a chilly range where the minimum can dip to -4°C (25°F) and the maximum can reach 13°C (56°F). With 229 mm (9.0 in) of precipitation spread over 21 days, be prepared for wet weather, complemented by a high average humidity of 87%.

December Temperature in Cathlamet

In December in Cathlamet, the average temperature is 5°C (41°F), with a maximum that can reach 13°C (56°F) and a minimum that can drop as low as -4°C (25°F). Be sure to pack warm clothing and prepare for chilly conditions when traveling during this time.

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

The chart illustrates December temperature patterns in Cathlamet, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cathlamet, December typically has an average temperature of 5°C (41°F), with highs reaching up to 13°C (56°F) and lows dropping to around -4°C (25°F).
JanFebMarAprMayJunJulAugSepOctNovDec424145495459616360524641
Data source: Temperature data for Cathlamet 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 Cathlamet

In Cathlamet in December, the total precipitation amount is 229 mm (9.0 in) spread across 21 days.

December Precipitation Trends in Cathlamet

The chart displays monthly precipitation patterns in Cathlamet, 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 Cathlamet, December typically receives around 229 mm (9.0 inches) of precipitation spread over approximately 21 days.
JanFebMarAprMayJunJulAugSepOctNovDec2141921491347463111291151212230
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Cathlamet

In Cathlamet in December humidity is 87%. With an average temperature of 5°C (41°F), this humidity feels like a heavy, damp blanket enveloping you, making every step seem laborious and the chill more biting, which can be quite challenging for traveling.

December Average Humidity in Cathlamet

This chart illustrates the average monthly humidity levels in Cathlamet, 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 Cathlamet is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%85%83%84%84%82%73%74%83%86%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Cathlamet

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

Maximum UV Index Levels in Cathlamet for December

The chart shows the monthly maximum UV Index (UVI) for Cathlamet 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 Cathlamet typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2356910987532
Data source: Cathlamet 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 Cathlamet Compares to Other Months

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

This table compares monthly weather conditions in Cathlamet, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (42°F)214 mm (8.4 inches)86%low
February Weather5°C (41°F)192 mm (7.5 inches)84%moderate
March Weather7°C (45°F)149 mm (5.9 inches)85%moderate
April Weather10°C (50°F)134 mm (5.3 inches)83%high
May Weather12°C (55°F)74 mm (2.9 inches)84%very high
June Weather15°C (59°F)62 mm (2.5 inches)84%very high
July Weather16°C (62°F)11 mm (0.4 inches)82%very high
August Weather17°C (63°F)12 mm (0.5 inches)73%very high
September Weather16°C (60°F)91 mm (3.6 inches)74%high
October Weather11°C (52°F)151 mm (5.9 inches)83%moderate
November Weather8°C (46°F)212 mm (8.3 inches)86%moderate
December Weather5°C (41°F)229 mm (9.0 inches)87%low

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