December Weather in Scappoose, United States

Last updated: June 24, 2025

In December, the average temperature in Scappoose, United States hovers around 5°C (40°F), but don’t be surprised by the temperature fluctuations—it can dip to a brisk -4°C (25°F) or rise to a comfortable 14°C (58°F). You'll also want to prepare for a fair bit of wet weather, with precipitation totaling 186 mm (7.3 in) over about 19 days. With an average humidity of 87%, it’s safe to say that Scappoose has a notably chilly and damp climate this time of year.

December Temperature in Scappoose

In December in Scappoose, the average temperature is 5°C (40°F), with a maximum reaching 14°C (58°F) and a minimum dropping as low as -4°C (25°F). Travelers should be prepared for chilly conditions, so layering clothing is recommended for comfort during their visit.

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

The chart illustrates December temperature patterns in Scappoose, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Scappoose, December typically has an average temperature of 5°C (40°F), with highs reaching up to 14°C (58°F) and lows dropping to around -4°C (25°F).

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

December Precipitation in Scappoose

In Scappoose in December, the precipitation amount is 186 mm (7.3 in) over a span of 19 days.

December Precipitation Trends in Scappoose

The chart displays monthly precipitation patterns in Scappoose, 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 Scappoose, December typically receives around 186 mm (7.3 inches) of precipitation spread over approximately 19 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 Scappoose

In Scappoose in December, humidity is 87%. With an average temperature of 5°C (40°F), this humidity feels like a damp chill that wraps around you, making outdoor excursions less enjoyable and requiring extra layers to stay comfortable while exploring.

December Average Humidity in Scappoose

This chart illustrates the average monthly humidity levels in Scappoose, 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 Scappoose 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 Scappoose

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

Maximum UV Index Levels in Scappoose for December

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

Data source: Scappoose 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 Scappoose Compares to Other Months

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

This table compares monthly weather conditions in Scappoose, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (41°F)	176 mm (6.9 inches)	85%	low
February Weather	4°C (40°F)	163 mm (6.4 inches)	84%	moderate
March Weather	7°C (45°F)	140 mm (5.5 inches)	85%	moderate
April Weather	10°C (50°F)	119 mm (4.7 inches)	83%	high
May Weather	13°C (57°F)	64 mm (2.5 inches)	83%	very high
June Weather	16°C (62°F)	54 mm (2.1 inches)	83%	very high
July Weather	19°C (66°F)	8 mm (0.3 inches)	82%	very high
August Weather	20°C (68°F)	8 mm (0.3 inches)	74%	very high
September Weather	17°C (62°F)	74 mm (2.9 inches)	71%	high
October Weather	11°C (52°F)	107 mm (4.2 inches)	81%	moderate
November Weather	7°C (45°F)	166 mm (6.5 inches)	87%	moderate
December Weather	5°C (40°F)	186 mm (7.3 inches)	87%	low