2025 Compare Climate & Weather:
Ann Arbor, MI vs Portland, OR

Highlights

On average, there are 144 sunny days per year in Portland. Ann Arbor averages 178 sunny days per year. The US average is 205 sunny days.

Portland, Oregon gets 42.8 inches of rain, on average, per year. Ann Arbor, Michigan gets 36 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Portland averages 2.6 inches of snow per year. Ann Arbor averages 43 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Portland, Oregon
Summer High: the July high is around 80.5 degrees
Winter Low: the January low is 36.4
Rain: averages 42.8 inches of rain a year
Snow: averages 2.6 inches of snow a year

Ann Arbor, Michigan
Summer High: the July high is around 82.8 degrees
Winter Low: the January low is 16.5
Rain: averages 36 inches of rain a year
Snow: averages 43 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Portland is 7.5 (10=best), which means it is more comfortable than most places in Oregon.

The annual BestPlaces Comfort Index for Ann Arbor is 6.7 (10=best), which means it is more comfortable than most places in Michigan.

Today's Weather - Ann Arbor, MI

59°F

Today's Weather - Portland, OR

81°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Ann Arbor / Portland

July is the hottest month for Ann Arbor with an average high temperature of 82.8°, which ranks it as warmer than most places in Michigan. In Ann Arbor, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Ann Arbor are June, August and September.

August is the hottest month for Portland with an average high temperature of 81.1°, which ranks it as cooler than most places in Oregon. In Portland, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Portland are September, July and August.

January has the coldest nighttime temperatures for Ann Arbor with an average of 16.5°. This is warmer than most places in Michigan.

December has the coldest nighttime temperatures for Portland with an average of 35.6°. This is warmer than most places in Oregon.

In Ann Arbor, there are 5.8 days annually when the high temperature is over 90°, which is about average compared to other places in Michigan.

In Portland, there are 11.6 days annually when the high temperature is over 90°, which is cooler than most places in Oregon.

In Ann Arbor, there are 140.9 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Michigan.

In Portland, there are 29.2 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Oregon.

In Ann Arbor, there are 3.9 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Michigan.

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

June is the wettest month in Ann Arbor with 3.7 inches of rain, and the driest month is February with 2.2 inches. The wettest season is Autumn with 30% of yearly precipitation and 20% occurs in Spring, which is the driest season. The annual rainfall of 36.0 inches in Ann Arbor means that it is wetter than most places in Michigan.


December is the wettest month in Portland with 6.8 inches of rain, and the driest month is July with 0.7 inches. The wettest season is Spring with 41% of yearly precipitation and 7% occurs in Autumn, which is the driest season. The annual rainfall of 42.8 inches in Portland means that it is about average compared to other places in Oregon.

December is the rainiest month in Ann Arbor with 13.9 days of rain, and September is the driest month with only 9.6 rainy days. There are 136.9 rainy days annually in Ann Arbor, which is rainier than most places in Michigan. The rainiest season is Spring when it rains 28% of the time and the driest is Autumn with only a 23% chance of a rainy day.

November is the rainiest month in Portland with 19.3 days of rain, and August is the driest month with only 3.7 rainy days. There are 155.9 rainy days annually in Portland, which is rainier than most places in Oregon. The rainiest season is Spring when it rains 34% of the time and the driest is Autumn with only a 11% chance of a rainy day.

An annual snowfall of 43.0 inches in Ann Arbor means that it is less snowy than most places in Michigan.

An annual snowfall of 2.6 inches in Portland means that it is less snowy than most places in Oregon.

January is the snowiest month in Ann Arbor with 12.4 inches of snow, and 6 months of the year have significant snowfall.

December is the snowiest month in Portland with 0.9 inches of snow, and 3 months of the year have significant snowfall.