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December Weather in Corvallis, United States

Last updated: June 24, 2025

In December, the average temperature in Corvallis, United States hovers around -6°C (22°F), with extremes ranging from a chilly -24°C (-11°F) to a surprisingly mild 13°C (56°F). Expect about 62 mm (2.5 in) of precipitation spread over 13 days, and brace yourself for high humidity levels, averaging a frosty 95%.

December Temperature in Corvallis

In December in Corvallis, the average temperature is -6°C (22°F). Maximums can reach 13°C (56°F) and minimums can be as low as -24°C (-11°F). Be prepared for a range of temperatures and pack accordingly for your trip!

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

The chart illustrates December temperature patterns in Corvallis, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Corvallis, December typically has an average temperature of -6°C (22°F), with highs reaching up to 13°C (56°F) and lows dropping to around -24°C (-11°F).
JanFebMarAprMayJunJulAugSepOctNovDec232232364756666455392922
Data source: Temperature data for Corvallis 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 Corvallis

In Corvallis in December, the total precipitation amount is 62 mm (2.5 in) spread over the course of 13 days.

December Precipitation Trends in Corvallis

The chart displays monthly precipitation patterns in Corvallis, 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 Corvallis, December typically receives around 62 mm (2.5 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec439860697277172134655863
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Corvallis

In Corvallis in December, humidity is 95%. With an average temperature of -6°C (22°F), this humidity feels like a biting chill that penetrates layers of clothing, making outdoor activities uncomfortable and breath feel heavy, even as the cold air clings to your skin.

December Average Humidity in Corvallis

This chart illustrates the average monthly humidity levels in Corvallis, 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 Corvallis is approximately 95%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%92%89%85%80%78%77%66%67%77%89%95%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Corvallis

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

Maximum UV Index Levels in Corvallis for December

The chart shows the monthly maximum UV Index (UVI) for Corvallis 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 Corvallis typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec346810101098532
Data source: Corvallis 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 Corvallis Compares to Other Months

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

This table compares monthly weather conditions in Corvallis, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)43 mm (1.7 inches)93%moderate
February Weather-5°C (23°F)98 mm (3.9 inches)92%moderate
March Weather0°C (32°F)60 mm (2.4 inches)89%high
April Weather2°C (36°F)69 mm (2.7 inches)85%very high
May Weather8°C (47°F)72 mm (2.8 inches)80%very high
June Weather14°C (57°F)77 mm (3.0 inches)78%very high
July Weather19°C (66°F)17 mm (0.7 inches)77%very high
August Weather18°C (65°F)21 mm (0.8 inches)66%very high
September Weather13°C (55°F)34 mm (1.3 inches)67%very high
October Weather4°C (39°F)65 mm (2.5 inches)77%moderate
November Weather-1°C (30°F)58 mm (2.3 inches)89%moderate
December Weather-6°C (22°F)62 mm (2.5 inches)95%low

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