Average Weather in Corvallis Oregon, United States
In Corvallis, the summers are warm, dry, and mostly clear and the winters are chilly, wet, and mostly cloudy. Over the course of the year, the temperature typically varies from 36°F to 86°F and is rarely below 25°F or above 97°F.
The hot season lasts for 3.0 months, from June 22 to September 21, with an average daily high temperature above 78°F. The hottest day of the year is August 3, with an average high of 86°F and low of 55°F.
The cool season lasts for 3.4 months, from November 13 to February 23, with an average daily high temperature below 55°F. The coldest day of the year is December 23, with an average low of 36°F and high of 46°F.
Average High and Low Temperature
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature
In Corvallis, the average percentage of the sky covered by clouds experiences extreme seasonal variation over the course of the year.
The clearer part of the year in Corvallis begins around June 8 and lasts for 4.0 months, ending around October 9. On July 27, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 83% of the time, and overcast or mostly cloudy 17% of the time.
The cloudier part of the year begins around October 9 and lasts for 8.0 months, ending around June 8. On January 16, the cloudiest day of the year, the sky is overcast or mostly cloudy 75% of the time, and clear, mostly clear, or partly cloudy 25% of the time.
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Corvallis varies very significantly throughout the year.
The wetter season lasts 6.9 months, from October 13 to May 9, with a greater than 31% chance of a given day being a wet day. The chance of a wet day peaks at 58% on November 27.
The drier season lasts 5.1 months, from May 9 to October 13. The smallest chance of a wet day is 3% on August 4.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 57% on November 18.
Daily Chance of Precipitation
To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Corvallis experiences extreme seasonal variation in monthly rainfall.
The rainy period of the year lasts for 11 months, from August 18 to July 15, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around December 2, with an average total accumulation of 9.4 inches.
The rainless period of the year lasts for 1.1 months, from July 15 to August 18. The least rain falls around July 31, with an average total accumulation of 0.3 inches.
Average Monthly Rainfall
The sliding 31-day liquid-equivalent quantity of snowfall in Corvallis does not vary significantly over the course of the year, staying within 0.1 inches of 0.1 inches throughout.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Corvallis varies significantly over the course of the year. In 2017, the shortest day is December 21, with 8 hours, 49 minutes of daylight; the longest day is June 21, with 15 hours, 34 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:27 AM on June 15, and the latest sunrise is 2 hours, 28 minutes later at 7:55 AM on November 4. The earliest sunset is at 4:32 PM on December 9, and the latest sunset is 4 hours, 29 minutes later at 9:02 PM on June 26.
Daylight saving time (DST) is observed in Corvallis during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.
Sunrise & Sunset with Twilight and Daylight Saving Time
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.
The perceived humidity level in Corvallis, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.
Humidity Comfort Levels
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.The average hourly wind speed in Corvallis does not vary significantly over the course of the year, remaining within 0.4 miles per hour of 3.0 miles per hour throughout.
Average Wind Speed
The predominant average hourly wind direction in Corvallis varies throughout the year.
The wind is most often from the west for 1.9 months, from April 10 to June 7, with a peak percentage of 42% on May 28. The wind is most often from the north for 4.3 months, from June 7 to October 15, with a peak percentage of 58% on July 21. The wind is most often from the south for 5.8 months, from October 15 to April 10, with a peak percentage of 48% on January 1.
Corvallis is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.
The average water temperature experiences some seasonal variation over the course of the year.
The time of year with warmer water lasts for 3.5 months, from June 12 to September 28, with an average temperature above 56°F. The day of the year with the warmest water is August 25, with an average temperature of 57°F.
The time of year with cooler water lasts for 4.2 months, from December 13 to April 18, with an average temperature below 51°F. The day of the year with the coolest water is February 6, with an average temperature of 50°F.
Average Water Temperature
This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.
The brighter period of the year lasts for 2.9 months, from May 27 to August 25, with an average daily incident shortwave energy per square meter above 6.1 kWh. The brightest day of the year is July 16, with an average of 7.4 kWh.
The darker period of the year lasts for 3.9 months, from October 26 to February 23, with an average daily incident shortwave energy per square meter below 2.4 kWh. The darkest day of the year is December 26, with an average of 1.1 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Corvallis are 44.565 deg latitude, -123.262 deg longitude, and 226 ft elevation.
The topography within 2 miles of Corvallis contains only modest variations in elevation, with a maximum elevation change of 233 feet and an average elevation above sea level of 229 feet. Within 10 miles contains only modest variations in elevation (1,949 feet). Within 50 miles contains very significant variations in elevation (4,948 feet).
The area within 2 miles of Corvallis is covered by artificial surfaces (64%) and cropland (32%), within 10 miles by cropland (62%) and trees (20%), and within 50 miles by trees (45%) and cropland (27%).
This report illustrates the typical weather in Corvallis, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Corvallis.
For each station, the records are corrected for the elevation difference between that station and Corvallis according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Corvallis is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Corvallis and a given station.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for aiports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.