nomadseason

December Weather in Oregon, United States

Last updated: June 24, 2025

In December, the average temperature in Oregon, United States hovers around 2°C (36°F), with extremes ranging from a chilly -21°C (-6°F) to a comfortable 23°C (74°F). Expect about 32 mm (1.3 in) of precipitation over 4 days, contributing to an average humidity of 84%. Perfect for cozying up indoors or taking a brisk walk in the crisp air!

December Temperature in Oregon

In December in Oregon, the average temperature is 2°C (36°F), with maximums reaching up to 23°C (74°F) and minimums dropping as low as -21°C (-6°F). Travelers should be prepared for a wide range of temperatures and pack accordingly!

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

The chart illustrates December temperature patterns in Oregon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Oregon, December typically has an average temperature of 2°C (36°F), with highs reaching up to 23°C (74°F) and lows dropping to around -21°C (-6°F).
JanFebMarAprMayJunJulAugSepOctNovDec283045536577797671554235
Data source: Temperature data for Oregon generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Oregon

In Oregon in December, the total precipitation amount is 32 mm (1.3 in), accumulated over a period of 4 days.

December Precipitation Trends in Oregon

The chart displays monthly precipitation patterns in Oregon, 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 Oregon, December typically receives around 32 mm (1.3 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec41319282168133120110831234032
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in Oregon

In Oregon in December, humidity is 84%. With an average temperature of 2°C (36°F), this humidity feels like a cold, damp blanket wrapping around you, making outdoor activities less inviting and requiring extra layers to stay comfortable while traveling.

December Average Humidity in Oregon

This chart illustrates the average monthly humidity levels in Oregon, 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 Oregon is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%78%70%73%82%82%81%78%71%71%81%84%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Oregon

In Oregon in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Oregon, you can check the information here.

Maximum UV Index Levels in Oregon for December

The chart shows the monthly maximum UV Index (UVI) for Oregon 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 Oregon typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111199643
Data source: Oregon 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 Oregon Compares to Other Months

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

This table compares monthly weather conditions in Oregon, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)41 mm (1.6 inches)76%moderate
February Weather-1°C (30°F)31 mm (1.2 inches)77%moderate
March Weather7°C (45°F)92 mm (3.6 inches)70%high
April Weather12°C (53°F)82 mm (3.2 inches)73%very high
May Weather18°C (65°F)168 mm (6.6 inches)82%very high
June Weather25°C (77°F)132 mm (5.2 inches)82%extreme
July Weather26°C (79°F)119 mm (4.7 inches)81%extreme
August Weather24°C (76°F)110 mm (4.3 inches)78%very high
September Weather22°C (71°F)83 mm (3.2 inches)71%very high
October Weather13°C (56°F)123 mm (4.8 inches)71%high
November Weather6°C (43°F)40 mm (1.6 inches)81%moderate
December Weather2°C (36°F)32 mm (1.3 inches)84%moderate

Compare Oregon's Climate with Cities Worldwide