December Weather in Corvallis, United States

Last updated: June 24, 2025

In December, the average temperature in Corvallis, United States hovers around 5°C (41°F). While you might experience a crisp chill with a minimum of -6°C (21°F), the mercury can peak at a mild 17°C (63°F). Expect 189 mm (7.4 in) of rain spread across 17 days, accompanied by average humidity levels of 87%, creating a refreshing atmosphere throughout the month.

December Temperature in Corvallis

In December in Corvallis, the average temperature is 5°C (41°F), with maximums reaching 17°C (63°F) and minimums dropping as low as -6°C (21°F). Be sure to pack accordingly for varied weather conditions during your travels.

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 5°C (41°F), with highs reaching up to 17°C (63°F) and lows dropping to around -6°C (21°F).
JanFebMarAprMayJunJulAugSepOctNovDec414145505663686963534641
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 189 mm (7.4 in) over a span of 17 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 189 mm (7.4 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec1551791331176042356184139189
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 87%. With an average temperature of 5°C (41°F), this humidity feels like a heavy, damp blanket enveloping you, making every step seem laborious and the chill more biting, which can be quite challenging for traveling.

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 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%85%83%83%84%82%74%71%81%87%87%
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.
JanFebMarAprMayJunJulAugSepOctNovDec246710101098532
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 Weather5°C (42°F)155 mm (6.1 inches)85%low
February Weather5°C (41°F)179 mm (7.0 inches)84%moderate
March Weather7°C (45°F)133 mm (5.2 inches)85%high
April Weather10°C (50°F)117 mm (4.6 inches)83%high
May Weather13°C (57°F)60 mm (2.3 inches)83%very high
June Weather17°C (63°F)42 mm (1.7 inches)83%very high
July Weather20°C (69°F)3 mm (0.1 inches)82%very high
August Weather21°C (69°F)5 mm (0.2 inches)74%very high
September Weather17°C (64°F)61 mm (2.4 inches)71%very high
October Weather12°C (53°F)84 mm (3.3 inches)81%moderate
November Weather8°C (46°F)139 mm (5.5 inches)87%moderate
December Weather5°C (41°F)189 mm (7.4 inches)87%low

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