This report describes the typical weather at the Corvallis Municipal Airport (Corvallis, Oregon, United States) weather station over the course of an average year. It is based on the historical records from 1991 to 2012. Earlier records are either unavailable or unreliable.
Corvallis, Oregon has a mediterranean climate with dry warm summers and mild winters. The area within 25 mi of this station is covered by forests (67%) and croplands (32%).
Over the course of a year, the temperature typically varies from 36°F to 85°F and is rarely below 27°F or above 95°F.
The warm season lasts from June 25 to September 22 with an average daily high temperature above 77°F. The hottest day of the year is August 4, with an average high of 85°F and low of 56°F.
The cold season lasts from November 12 to March 1 with an average daily high temperature below 54°F. The coldest day of the year is December 27, with an average low of 36°F and high of 46°F.
The length of the day varies significantly over the course of the year. The shortest day is December 21 with 8:49 hours of daylight; the longest day is June 20 with 15:34 hours of daylight.
The earliest sunrise is at 5:27am on June 17 and the latest sunset is at 9:03pm on June 23. The latest sunrise is at 7:54am on November 3 and the earliest sunset is at 4:33pm on December 8.
Daylight savings time (DST) is observed in this location during 2012, starting in the spring on March 11 and ending in the fall on November 4.
The median cloud cover ranges from 4% (clear) to 97% (overcast). The sky is cloudiest on December 18 and clearest on August 13. The clearer part of the year begins around June 7. The cloudier part of the year begins around October 11.
On August 13, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 62% of the time, and overcast or mostly cloudy 19% of the time.
On December 18, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 74% of the time, and clear or mostly clear 21% of the time.
The average probability that some form of precipitation will be observed in a given day is 0%, with very little seasonal variation.
Over the entire year, the most common forms of precipitation are thunderstorms.
Thunderstorms are the most severe precipitation observed during 100% of those days with precipitation. They are most likely around June 4, when it is observed during 1% of all days.
During the warm season, which lasts from June 25 to September 22, there is a 1% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of thunderstorms (100% of days with precipitation have at worst thunderstorms).
During the cold season, which lasts from November 12 to March 1, there is a 0% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of thunderstorms (100% of days with precipitation have at worst thunderstorms).
Either snow is exceptionally unlikely to fall at any time during the year at this location or this station does not reliably report precipitation types.
The relative humidity typically ranges from 34% (comfortable) to 92% (very humid) over the course of the year, rarely dropping below 21% (dry) and reaching as high as 99% (very humid).
The air is driest around August 2, at which time the relative humidity drops below 39% (comfortable) three days out of four; it is most humid around January 1, exceeding 87% (very humid) three days out of four.
Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.
Over the course of a year, the dew point typically varies from 32°F (dry) to 55°F (very comfortable) and is rarely below 24°F (dry) or above 60°F (comfortable).
The time of the year between May 23 and October 5 is the most comfortable, with dew points that are neither too dry nor too muggy.
Over the course of the year typical wind speeds vary from 0 mph to 16 mph (calm to moderate breeze), rarely exceeding 21 mph (fresh breeze).
The highest average wind speed of 8 mph (gentle breeze) occurs around July 24, at which time the average daily maximum wind speed is 16 mph (moderate breeze).
The lowest average wind speed of 5 mph (light breeze) occurs around October 17, at which time the average daily maximum wind speed is 12 mph (gentle breeze).