December Weather in Siletz, United States

Last updated: June 24, 2025

In December, the average temperature in Siletz, United States hovers around 8°C (46°F), with minimums dipping to 0°C (32°F) and maximums reaching 13°C (56°F). Travelers should prepare for a wet month, as 292 mm (11.5 in) of precipitation is expected over 20 days. The atmosphere will feel quite humid, with an average humidity of 87%.

December Temperature in Siletz

In December in Siletz, the average temperature is 8°C (46°F). The maximum can reach 13°C (56°F), while the minimum can drop to as low as 0°C (32°F). Be sure to pack layers for your trip, as the weather can vary significantly throughout the day.

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

The chart illustrates December temperature patterns in Siletz, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Siletz, December typically has an average temperature of 8°C (46°F), with highs reaching up to 13°C (56°F) and lows dropping to around 0°C (32°F).

Data source: Temperature data for Siletz generated using information from the Copernicus Climate Change Service.

December Precipitation in Siletz

In Siletz in December, the total precipitation amount is 292 mm (11.5 in), occurring over a span of 20 days.

December Precipitation Trends in Siletz

The chart displays monthly precipitation patterns in Siletz, 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 Siletz, December typically receives around 292 mm (11.5 inches) of precipitation spread over approximately 20 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

December Humidity in Siletz

In Siletz in December, humidity is 87%. With an average temperature of 8°C (46°F), this humidity feels like a chilly, damp fog clinging to your skin, making outdoor activities a bit uncomfortable and causing even mild exertion to leave you feeling clammy and cold.

December Average Humidity in Siletz

This chart illustrates the average monthly humidity levels in Siletz, 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 Siletz is approximately 87%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Siletz

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

Maximum UV Index Levels in Siletz for December

The chart shows the monthly maximum UV Index (UVI) for Siletz 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 Siletz typically reaches 2, which falls under the low exposure category.

Data source: Siletz 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 Siletz Compares to Other Months

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

This table compares monthly weather conditions in Siletz, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	8°C (46°F)	271 mm (10.7 inches)	85%	low
February Weather	7°C (44°F)	248 mm (9.8 inches)	84%	moderate
March Weather	8°C (46°F)	191 mm (7.5 inches)	85%	high
April Weather	9°C (49°F)	158 mm (6.2 inches)	83%	high
May Weather	11°C (52°F)	74 mm (2.9 inches)	83%	very high
June Weather	13°C (56°F)	62 mm (2.4 inches)	83%	very high
July Weather	15°C (58°F)	9 mm (0.4 inches)	82%	very high
August Weather	15°C (59°F)	13 mm (0.5 inches)	74%	very high
September Weather	14°C (58°F)	71 mm (2.8 inches)	71%	high
October Weather	12°C (54°F)	151 mm (5.9 inches)	81%	moderate
November Weather	10°C (50°F)	254 mm (10.0 inches)	87%	moderate
December Weather	8°C (46°F)	292 mm (11.5 inches)	87%	low