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Average Weather in Corvallis Oregon, United States

In Corvallis, the temperature typically varies from 36°F to 86°F over the course of the year, and is rarely below 25°F or above 97°F.

The hot season lasts for 91 days, 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 102 days, 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 daily average high (red line) and low (blue line) temperature with percentile bands, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

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

12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDecchillychillycoldcoldcoolcoolcomfortablecomfortablewarmwarm
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.

Sun

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 number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

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 237 days, and ending in the fall on November 5.

Sunrise & Sunset with Twilight and Daylight Saving Time

The solar day over the course of the year 2017. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

Clouds

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 123 days, 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 242 days, 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.

Cloud Cover

clearerclearercloudiercloudiercloudiercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJan 1675%Jan 1675%Jul 2717%Jul 2717%Jun 846%Jun 846%Oct 946%Oct 946%overcastovercastpartly cloudypartly cloudymostly clearmostly clearclearclear
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

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 208 days, 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 157 days, 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

wetwetwetwetdrydry0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecNov 2758%Nov 2758%Aug 43%Aug 43%Oct 1331%Oct 1331%May 931%May 931%snowsnowrainrain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

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 in the year. Corvallis experiences very significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 331 days, 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 34 days, from July 15 to August 18. The least rain falls around July 31, with and average total accumulation of 0.3 inches.

Average Monthly Rainfall

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Snowfall

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 average liquid-equivalent snowfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average rainfall.

Humidity

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

The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

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

0.0 mph0.5 mph1.0 mph1.5 mph2.0 mph2.5 mph3.0 mph3.5 mph4.0 mph4.5 mph5.0 mph5.5 mph6.0 mphJanFebMarAprMayJunJulAugSepOctNovDecDec 13.4 mphDec 13.4 mphSep 282.7 mphSep 282.7 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in Corvallis varies throughout the year.

The wind is most often from the west for 58 days, from April 10 to June 7, with a peak percentage of 42% on May 28. The wind is most often from the north for 130 days, from June 7 to October 15, with a peak percentage of 58% on July 21. The wind is most often from the south for 177 days, from October 15 to April 10, with a peak percentage of 51% on November 13.

Wind Direction

SSWWNNSS0%20%40%60%80%100%JanFebMarAprMayJunJulAugSepOctNovDecwestwestsouthsoutheasteastnorthnorth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

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 108 days, 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 126 days, 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

The daily average water temperature (purple line) with percentile bands, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 very significant seasonal variation over the course of the year.

The brighter period of the year lasts for 90 days, 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 120 days, 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

The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Corvallis are 44.565 deg latitude, -123.262 deg longitude, and 226 ft elevation (map ).

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 very significant variations in elevation (1,949 feet). Within 50 miles contains extreme 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%).

Data Sources

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.

The stations contributing to this reconstruction are: Corvallis Municipal Airport (93%, 7 kilometers, south) and McNary Field (7%, 43 kilometers, northeast).

Other Data

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 .