2025 Compare Climate & Weather:
Philadelphia, PA vs Boulder, CO

Highlights

On average, there are 245 sunny days per year in Boulder. Philadelphia averages 207 sunny days per year. The US average is 205 sunny days.

Boulder, Colorado gets 18.1 inches of rain, on average, per year. Philadelphia, Pennsylvania gets 47.2 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Boulder averages 71.1 inches of snow per year. Philadelphia averages 13.1 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

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

Philadelphia, Pennsylvania
Summer High: the July high is around 87 degrees
Winter Low: the January low is 26
Rain: averages 47.2 inches of rain a year
Snow: averages 13.1 inches of snow a year

BestPlaces Comfort Index

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

The annual BestPlaces Comfort Index for Philadelphia is 7.3 (10=best), which means it is one of the most pleasant places in Pennsylvania.

Today's Weather - Philadelphia, PA

68°F

Today's Weather - Boulder, CO

55°F

Average Monthly High / Low (°F)

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

July is the hottest month for Philadelphia with an average high temperature of 87.0°, which ranks it as one of the hottest places in Pennsylvania. In Philadelphia, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Philadelphia are September, May and June.

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.

January has the coldest nighttime temperatures for Philadelphia with an average of 26.0°. This is one of the warmest places in Pennsylvania.

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

In Philadelphia, there are 25.2 days annually when the high temperature is over 90°, which is one of the hottest places in Pennsylvania.

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 Philadelphia, there are 77.5 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Pennsylvania.

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 Philadelphia, there are 0.2 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Pennsylvania.

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

July is the wettest month in Philadelphia with 4.7 inches of rain, and the driest month is February with 2.9 inches. The wettest season is Autumn with 28% of yearly precipitation and 22% occurs in Spring, which is the driest season. The annual rainfall of 47.2 inches in Philadelphia means that it is wetter than most places in Pennsylvania.


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.

April is the rainiest month in Philadelphia with 11.7 days of rain, and September is the driest month with only 8.5 rainy days. There are 118.9 rainy days annually in Philadelphia, which is less rainy than most places in Pennsylvania. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 22% chance of a rainy day.

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.

An annual snowfall of 13.1 inches in Philadelphia means that it is one of the least snowy places in Pennsylvania.

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

February is the snowiest month in Philadelphia with 4.8 inches of snow, and 4 months of the year have significant snowfall.

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