Climate and monthly weather forecast
Corvallis, OR

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A large river with two bridges across it in the city of Corvalis, Oregon, home to the famed Oregon State University
A large river with two bridges across it in the city of Corvalis, Oregon, home to the famed Oregon State University

The climate of Corvallis

Corvallis, a city nestled in the heartland of Oregon, USA, is subject to Mediterranean warm summer climates. From a classification perspective, this weather type is denoted as Csb according to the Köppen climate system. This geographically niche area sports uniformly slightly varying weather throughout the year.

Spanning silent, cold winters and warm, vibrant summers, Corvallis’ yearly temperatures traverse between 34.2°F (1.2°C) and 80.4°F (26.9°C). However, the line of humidity running parallel to this trend enhances the feel of the temperatures throughout the year, standing tall at an annual average of 79%.

There’s an interesting play of sunshine, with considerable fluctuations ranging from 3.6 hours to 10.8 hours a day. The setting sun also brings with it varied visibility levels, with an average of 4.5 miles. The city’s annual pressure averages around 30.05 in, a conducive level for maintaining the overall balanced climate.

Rainfall marks the city's character quite evidently, from a low of 0.28" (7mm) to a magnanimous 4.8" (122mm), while its windy counterpart ranges from 4mph (6.4km/h) to 4.9mph (7.9km/h) with gusts ranging up to 8.5mph (13.7km/h). Snowfall is not quite frequent, from 0" (0mm) to a nominal 1.77" (45mm).

The best time to visit Corvallis

Ideally, a visitor might consider the warmer summer months between June to August to experience Corvallis at its finest. In this period, daily temperatures average from 70.3°F (21.3°C) to 80.4°F (26.9°C) with the city receiving a maximum of 10.8 hours of sunshine in the day. Relative humidity hovers around the 70% mark with the barometer recording an average pressure of 30.05 in. This spell of the year witnesses a quite minimal amount of rainfall, ranging from 0.28" (7mm) to 0.47" (12mm).

The worst time to visit Corvallis

Contrary to the summer months, the period from November to January might pose some displeasure for visitors. It is during these chilly months that the city experiences the lowest temperatures of the year, spanning from 34.2°F (1.2°C) to 51.4°F (10.8°C). In addition, these months record the highest humidity levels peaking at 88-89%. The city is also at its darkest during this duration with sunshine hours dwindling to 3.9 to 4.4 hours a day.

Spring weather in Corvallis

In the transition from winter to summer, March to May in Corvallis offer a unique blend of temperature ranges from 51.8°F (11°C) to 65.1°F (18.4°C). Rainfall during spring varies from 2.8" (71mm) to 3.86" (98mm). On the other hand, the spring breeze is quite mild, with wind speeds fluctuating between 4.4mph (7.1km/h) to 4.9mph (7.9km/h). It's also in the spring season that the city begins its transition from lower to higher daylight hours, shifting from 12 hours to 14.8 hours.

Summer weather in Corvallis

The vibrant months from June to August showcase a rich medley of warm temperatures ranging from 70.3°F (21.3°C) to 80.4°F (26.9°C). These months serve as the best period in terms of visibility with levels peaking at 5 miles. The humidity levels are at their lowest of the year, fluttering around the 70% mark while cloud coverage is also minimal. Interestingly, the city dishes out the highest UV indexes of 5, which makes it essential to keep the sunscreen handy.

Autumn weather in Corvallis

The period from September to November paints Corvallis in an autumn hue, with temperatures dipping between 73.4°F (23°C) to 51.4°F (10.8°C). The wind's intensity during these months ranges from 4mph (6.4km/h) to 4.3mph (6.9km/h) with gusts reaching up to 7.3mph (11.7km/h). Rainfall indications start to creep up in this season, varying between 1.42" (36mm) to 3.5" (89mm). Simultaneously, the sunlight hours start dwindling from high summer numbers to approximately 5.2 hours by November.

Winter weather in Corvallis

Winter in Corvallis spans the months of December to February, during which the city experiences the lowest temperatures of the year from 34.9°F (1.6°C) to 48.2°F (9°C). As the mercury falls, the rain becomes a constant companion with measurements going from 3.43" (87mm) to 4.8" (122mm). It’s also the period that receives some bits of snowfall registering from 0.04" (1mm) to 1.77" (45mm). Sunshine hours take a dip as well, dropping to a low of 3.6 hours in January.

Weather in January

The beginning of the year in Corvallis, Oregon, ushers in chilly weather, marked by consistent rainfall, low visibility, and relatively short days. Temperatures start to rise slightly, moving from the freezing conditions of December. Weather in January »

Weather in February

Winter continues its hold on Corvallis in February with temperatures remaining low, although not as cold as January. A steady amount of rainfall continues to characterize the weather along with frequent cloudy days leading to limited sunlight. Weather in February »

Weather in March

As Corvallis, Oregon transitions into spring in March, a gradually warming trend penetrates the persistently cooler winter temperatures. Along with the increasing temperatures, the city witnesses lengthened daylight hours, and shorter nights. Weather in March »

Weather in April

April is synonymous with springtime, bringing brighter, longer days to Corvallis, Oregon. Temperatures continue their ascent, and rainfall decreases slightly reducing the overall dampness felt in March. The lengthened daylight gives residents more time to enjoy outdoor activities. Weather in April »

Weather in May

The transition into late spring in May sees Corvallis, Oregon heated up by warming temperatures. The city experiences less cloud cover, which results in more sunshine and consequently, higher UV index. The change in weather conditions encourages outdoor activities with its clear, sunny days and a remarkably low rainfall of 1.61" (41mm). Weather in May »

Weather in June

June invites the summer season to Corvallis, Oregon. The weather is characterized by consistent sunshine, extended daylight hours, and warming temperatures, prompting residents to spend more time in outdoor activities. Rainfall reaches its lowest for the first half of the year, marking a distinct shift from previous months' frequent showers. Weather in June »

Weather in July

July marks the height of summer in Corvallis, Oregon. This period offers the highest temperatures, with heat intensifying to a high of 78.6°F (25.9°C). The lengthiest daytime and the least rainfall of the year make it a time for enjoying outdoor pursuits. Weather in July »

Weather in August

August continues to bath Corvallis, Oregon in warm, sunny weather. Although temperatures slightly decrease compared to July, they remain comfortably high. Similarly, daylight hours decrease modestly but still provide ample time for outdoor activities. Weather in August »

Weather in September

September brings a salient shift in Corvallis, Oregon's weather as summer transitions into fall. Along with falling temperatures, daylight hours begin to shorten and more cloud coverage is observed. Mild rain returns, marking the beginning of the wetter part of the year. Weather in September »

Weather in October

October ushers in the full onset of fall in Corvallis, Oregon. The month is characterized by cooler temperatures, increased cloud cover, and more frequent rainfall. The fall foliage, amplified by the drop in temperatures, transforms the city’s landscape with hues of amber, gold, and red. Weather in October »

Weather in November

November in Corvallis, Oregon is a witness to the dramatic transition from fall to winter. The temperatures continue their downward trend, bringing colder days and longer nights. Further increased rainfall results in higher relative humidity. Weather in November »

Weather in December

Winter descends in full force on Corvallis, Oregon in December. Cold temperatures combined with limited sunshine and shorter daylight hours create chilly conditions, perfect for indoor activities and cozy fireplaces. Rainfall reaches its peak for the year, contributing to the damp, colder climate. Weather in December »
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Frequently asked questions

How much does it rain in Corvallis?

In Corvallis, during the entire year, the rain falls for 169.2 days and collects up to 30.28" (769mm) of precipitation.

When does it snow in Corvallis?

January through March, November and December are months with snowfall in Corvallis.

How much does it snow in Corvallis?

Throughout the year, there are 4.6 snowfall days, and 3.27" (83mm) of snow is accumulated.

When is the lowest UV index in Corvallis?

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.

What is the snowiest month in Corvallis?

The month with the most snowfall is February, when snow falls for 1.8 days and typically aggregates up to 1.77" (45mm) of snow.

What is the month with the least sunshine in Corvallis?

With an average of 3.6h of sunshine, February has the least sunshine of the year in Corvallis, Oregon.

When is Daylight Saving Time (DST) in Corvallis?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Corvallis, Oregon, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from PDT to PST.

When it does not snow in Corvallis?

April through October are months without snowfall in Corvallis.

When are the longest days in Corvallis?

June has the longest days of the year in Corvallis, Oregon, with an average of 15h and 30min of daylight.

What are the months with the highest UV index in Corvallis?

June through August, with an average maximum UV index of 5, are months with the highest UV index.

What is the driest month in Corvallis?

July is the month with the least rainfall. Rain falls for 4.8 days and accumulates 0.28" (7mm) of precipitation.

What are the months with the most sunshine in Corvallis?

The months with the most sunshine in Corvallis are July and August, with an average of 10.8h of sunshine.

What month is the hottest in Corvallis?

August, recording an average high temperature of 80.4°F (26.9°C) and a low temperature of 52°F (11.1°C), is Corvallis's warmest month.

What is the least humid month in Corvallis?

With an average relative humidity of 69%, August is the least humid month.

What time of the year is the coldest in Corvallis?

Corvallis experiences its average lowest temperatures in December, reaching a peak of 44.8°F (7.1°C) and a minimum of 34.2°F (1.2°C).

What is the most humid month in Corvallis?

With an average relative humidity of 89%, December is the most humid month.

What is the rainiest month in Corvallis?

December is the month with the most rainfall in Corvallis. Rain falls for 19.1 days and accumulates 4.8" (122mm) of precipitation.

What is the month with the shortest days in Corvallis?

December has the shortest days of the year, with an average of 8h and 54min of daylight.

Average temperature
Corvallis, OR

Average temperature - Corvallis, OR

The warmest month (with the highest average high temperature) is August (80.4°F).
The month with the lowest average high temperature is December (44.8°F).

The month with the highest average low temperature is August (52°F).
The coldest month (with the lowest average low temperature) is December (34.2°F).

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Average pressure
Corvallis, OR

Average pressure - Corvallis, OR

The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).

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Average wind speed
Corvallis, OR

Average wind speed - Corvallis, OR

The windiest month (with the highest average wind speed) is March (4.9mph).
The calmest month (with the lowest average wind speed) is September (3.9mph).

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Average rainfall
Corvallis, OR

Average rainfall - Corvallis, OR

The wettest month (with the highest rainfall) is December (4.8").
The driest month (with the least rainfall) is July (0.28").

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Average rainfall days
Corvallis, OR

Average rainfall days - Corvallis, OR

The month with the highest number of rainy days is March (20.9 days).
The month with the least rainy days is August (4.5 days).

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Average snowfall
Corvallis, OR

Average snowfall - Corvallis, OR

The month with the highest snowfall is February (1.77").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days
Corvallis, OR

Average snowfall days - Corvallis, OR

The month with the highest number of snowfall days is February (1.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight / Average sunshine
Corvallis, OR

Average daylight / Average sunshine - Corvallis, OR

The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).

The months with the most sunshine are July and August (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 3h and 36min).

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Average sunshine days
Corvallis, OR

Average sunshine days - Corvallis, OR

The month with the most sunshine days is July (24.3 days).
The month with the least sunshine days is February (8.4 days).

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Average UV index
Corvallis, OR

Average UV index - Corvallis, OR

The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average visibility
Corvallis, OR

Average visibility - Corvallis, OR

The months with the highest visibility are June, July, August, September and October (5mi).
The months with the lowest visibility are January, February, March, April, May, November and December (4mi).

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Corvallis, Oregon, USA

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