2025 Compare Climate & Weather:
Boulder, CO vs Mosier, OR

Highlights

On average, there are 176 sunny days per year in Mosier. Boulder averages 245 sunny days per year. The US average is 205 sunny days.

Mosier, Oregon gets 20.5 inches of rain, on average, per year. Boulder, Colorado gets 18.1 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Mosier averages 15.5 inches of snow per year. Boulder averages 71.1 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Mosier, Oregon
Summer High: the July high is around 85.7 degrees
Winter Low: the January low is 30.2
Rain: averages 20.5 inches of rain a year
Snow: averages 15.5 inches of snow a year

Boulder, Colorado
Summer High: the July high is around 88.1 degrees
Winter Low: the January low is 18.9
Rain: averages 18.1 inches of rain a year
Snow: averages 71.1 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Mosier is 7.4 (10=best), which means it is more comfortable than most places in Oregon.

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

Today's Weather - Boulder, CO

48°F

Today's Weather - Mosier, OR

43°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Boulder / Mosier

July is the hottest month for Boulder with an average high temperature of 88.1°, which ranks it as about average compared to other places in Colorado. In Boulder, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Boulder are September, June and May.

August is the hottest month for Mosier with an average high temperature of 85.9°, which ranks it as warmer than most places in Oregon. In Mosier, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Mosier are June, September and May.

December has the coldest nighttime temperatures for Boulder with an average of 18.3°. This is one of the warmest places in Colorado.

December has the coldest nighttime temperatures for Mosier with an average of 29.5°. This is colder than most places in Oregon.

In Boulder, there are 32.4 days annually when the high temperature is over 90°, which is about average compared to other places in Colorado.

In Mosier, there are 30.2 days annually when the high temperature is over 90°, which is hotter than most places in Oregon.

In Boulder, there are 151.2 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Colorado.

In Mosier, there are 77.7 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Oregon.

In Boulder, there are 5.5 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Colorado.

In Mosier, there are 0.3 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Oregon.

May is the wettest month in Boulder with 2.5 inches of rain, and the driest month is January with 0.6 inches. The wettest season is Summer with 37% of yearly precipitation and 11% occurs in Spring, which is the driest season. The annual rainfall of 18.1 inches in Boulder means that it is wetter than most places in Colorado.


December is the wettest month in Mosier with 4.0 inches of rain, and the driest month is July with 0.2 inches. The wettest season is Spring with 50% of yearly precipitation and 5% occurs in Autumn, which is the driest season. The annual rainfall of 20.5 inches in Mosier means that it is drier than most places in Oregon.

May is the rainiest month in Boulder with 10.5 days of rain, and January is the driest month with only 4.7 rainy days. There are 88.0 rainy days annually in Boulder, which is rainier than most places in Colorado. The rainiest season is Autumn when it rains 31% of the time and the driest is Spring with only a 17% chance of a rainy day.

November is the rainiest month in Mosier with 16.0 days of rain, and July is the driest month with only 1.8 rainy days. There are 109.9 rainy days annually in Mosier, which is less rainy than most places in Oregon. The rainiest season is Spring when it rains 40% of the time and the driest is Autumn with only a 8% chance of a rainy day.

An annual snowfall of 71.1 inches in Boulder means that it is snowier than most places in Colorado.

An annual snowfall of 15.5 inches in Mosier means that it is snowier than most places in Oregon.

March is the snowiest month in Boulder with 14.3 inches of snow, and 9 months of the year have significant snowfall.

January is the snowiest month in Mosier with 5.2 inches of snow, and 5 months of the year have significant snowfall.