January Weather in Corvallis, United States

Last updated: June 24, 2025

In January, the average temperature in Corvallis, United States hovers around 5°C (42°F), making it a cool time of year. Expect a minimum plunge of -12°C (11°F) and a maximum rise to 15°C (60°F). With an average precipitation of 155 mm (6.1 in) spread over 16 days, you might want to pack an umbrella! The air is quite moist too, with an average humidity level of 85%, so be prepared for a chilly, damp climate.

January Temperature in Corvallis

In January in Corvallis, the average temperature is 5°C (42°F). Maximums can reach 15°C (60°F) while minimums can drop as low as -12°C (11°F). Travelers should prepare for a wide range of temperatures and pack accordingly for both chilly days and mild afternoons.

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

The chart illustrates January 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, January typically has an average temperature of 5°C (42°F), with highs reaching up to 15°C (60°F) and lows dropping to around -12°C (11°F).

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

January Precipitation in Corvallis

In Corvallis, in January, the total precipitation amount is 155 mm (6.1 in) spread over 16 days.

January Precipitation Trends in Corvallis

The chart displays monthly precipitation patterns in Corvallis, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Corvallis, January typically receives around 155 mm (6.1 inches) of precipitation spread over approximately 16 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

January Humidity in Corvallis

In Corvallis in January, humidity is 85%. With an average temperature of 5°C (42°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities uncomfortable and requiring extra layers to stay warm while exploring.

January Average Humidity in Corvallis

This chart illustrates the average monthly humidity levels in Corvallis, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Corvallis is approximately 85%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Corvallis

In Corvallis in January, 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 January

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

Data source: Corvallis January 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 January 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 January’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 January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (42°F)	155 mm (6.1 inches)	85%	low
February Weather	5°C (41°F)	179 mm (7.0 inches)	84%	moderate
March Weather	7°C (45°F)	133 mm (5.2 inches)	85%	high
April Weather	10°C (50°F)	117 mm (4.6 inches)	83%	high
May Weather	13°C (57°F)	60 mm (2.3 inches)	83%	very high
June Weather	17°C (63°F)	42 mm (1.7 inches)	83%	very high
July Weather	20°C (69°F)	3 mm (0.1 inches)	82%	very high
August Weather	21°C (69°F)	5 mm (0.2 inches)	74%	very high
September Weather	17°C (64°F)	61 mm (2.4 inches)	71%	very high
October Weather	12°C (53°F)	84 mm (3.3 inches)	81%	moderate
November Weather	8°C (46°F)	139 mm (5.5 inches)	87%	moderate
December Weather	5°C (41°F)	189 mm (7.4 inches)	87%	low