2025 Compare Climate & Weather:
Corvallis, OR vs Sumas, WA

Highlights

On average, there are 155 sunny days per year in Sumas. Corvallis averages 159 sunny days per year. The US average is 205 sunny days.

Sumas, Washington gets 40.2 inches of rain, on average, per year. Corvallis, Oregon gets 51.4 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Sumas averages 7.1 inches of snow per year. Corvallis averages 5.4 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Sumas, Washington
Summer High: the July high is around 73.7 degrees
Winter Low: the January low is 33.8
Rain: averages 40.2 inches of rain a year
Snow: averages 7.1 inches of snow a year

Corvallis, Oregon
Summer High: the July high is around 81.6 degrees
Winter Low: the January low is 34.1
Rain: averages 51.4 inches of rain a year
Snow: averages 5.4 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Sumas is 7.1 (10=best), which means it is about average compared to other places in Washington.

The annual BestPlaces Comfort Index for Corvallis is 7.3 (10=best), which means it is more comfortable than most places in Oregon.

Today's Weather - Corvallis, OR

58°F

Today's Weather - Sumas, WA

54°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Corvallis / Sumas

August is the hottest month for Corvallis with an average high temperature of 82.4°, which ranks it as about average compared to other places in Oregon. In Corvallis, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Corvallis are September, July and August.

August is the hottest month for Sumas with an average high temperature of 74.2°, which ranks it as cooler than most places in Washington. In Sumas, there are 2 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Sumas are August, July and September.

December has the coldest nighttime temperatures for Corvallis with an average of 33.8°. This is about average compared to other places in Oregon.

December has the coldest nighttime temperatures for Sumas with an average of 32.9°. This is about average compared to other places in Washington.

In Corvallis, there are 12.4 days annually when the high temperature is over 90°, which is cooler than most places in Oregon.

In Sumas, there are 0.8 days annually when the high temperature is over 90°, which is cooler than most places in Washington.

In Corvallis, there are 45.6 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Oregon.

In Sumas, there are 51.1 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Washington.

In Corvallis, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Oregon.

In Sumas, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Washington.

December is the wettest month in Corvallis with 9.3 inches of rain, and the driest month is July with 0.5 inches. The wettest season is Spring with 45% of yearly precipitation and 5% occurs in Autumn, which is the driest season. The annual rainfall of 51.4 inches in Corvallis means that it is wetter than most places in Oregon.


November is the wettest month in Sumas with 6.3 inches of rain, and the driest month is July with 1.3 inches. The wettest season is Spring with 33% of yearly precipitation and 12% occurs in Autumn, which is the driest season. The annual rainfall of 40.2 inches in Sumas means that it is about average compared to other places in Washington.

January is the rainiest month in Corvallis with 20.5 days of rain, and July is the driest month with only 3.3 rainy days. There are 161.8 rainy days annually in Corvallis, which is rainier than most places in Oregon. The rainiest season is Spring when it rains 35% of the time and the driest is Autumn with only a 10% chance of a rainy day.

November is the rainiest month in Sumas with 19.9 days of rain, and July is the driest month with only 6.4 rainy days. There are 163.9 rainy days annually in Sumas, which is rainier than most places in Washington. The rainiest season is Spring when it rains 31% of the time and the driest is Autumn with only a 14% chance of a rainy day.

An annual snowfall of 5.4 inches in Corvallis means that it is snowier than most places in Oregon.

An annual snowfall of 7.1 inches in Sumas means that it is about average compared to other places in Washington.

February is the snowiest month in Corvallis with 2.5 inches of snow, and 3 months of the year have significant snowfall.

January is the snowiest month in Sumas with 2.1 inches of snow, and 5 months of the year have significant snowfall.