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December Weather in Oregon, United States

Last updated: June 24, 2025

In Oregon, United States, the average temperature in December hovers around 0°C (32°F), with extreme variations ranging from a chilling -21°C (-6°F) to a mild 20°C (67°F). Expect about 51 mm (2.0 in) of precipitation spread over 6 days, contributing to the region's high average humidity of 84%.

December Temperature in Oregon

In December in Oregon, the average temperature is 0°C (32°F). Maximums can reach 20°C (67°F), and minimums can be as low as -21°C (-6°F). Be prepared for a wide range of temperatures and pack accordingly for your travels.

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 0°C (32°F), with highs reaching up to 20°C (67°F) and lows dropping to around -21°C (-6°F).
JanFebMarAprMayJunJulAugSepOctNovDec232539486172757367533832
Data source: Temperature data for Oregon 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 Oregon

In Oregon in December, the precipitation amount is 51 mm (2.0 in) over the course of 6 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 51 mm (2.0 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec60567910915712178771201164951
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Oregon

In Oregon in December, humidity is 84%. With an average temperature of 0°C (32°F), this humidity feels like a cold, damp chill that seeps into your clothes, making traveling uncomfortable and necessitating extra layers to stay warm despite the moisture-laden air.

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.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%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 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 Oregon, you can visit Hourly UV Index in Oregon.

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 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098632
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-5°C (23°F)60 mm (2.4 inches)82%moderate
February Weather-4°C (26°F)56 mm (2.2 inches)83%moderate
March Weather4°C (39°F)79 mm (3.1 inches)84%high
April Weather9°C (48°F)109 mm (4.3 inches)85%very high
May Weather16°C (61°F)156 mm (6.2 inches)79%very high
June Weather22°C (72°F)121 mm (4.8 inches)82%very high
July Weather24°C (76°F)78 mm (3.1 inches)80%very high
August Weather23°C (73°F)77 mm (3.0 inches)81%very high
September Weather20°C (67°F)120 mm (4.7 inches)80%very high
October Weather12°C (54°F)116 mm (4.6 inches)82%high
November Weather3°C (38°F)49 mm (1.9 inches)88%moderate
December Weather0°C (32°F)51 mm (2.0 inches)84%low

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