2025 Compare Climate & Weather:
Philadelphia, PA vs Boston, MA

Highlights

On average, there are 200 sunny days per year in Boston. Philadelphia averages 207 sunny days per year. The US average is 205 sunny days.

Boston, Massachusetts gets 47.4 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.

Boston averages 48.1 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

Boston, Massachusetts
Summer High: the July high is around 82.4 degrees
Winter Low: the January low is 19.2
Rain: averages 47.4 inches of rain a year
Snow: averages 48.1 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 Boston is 6.9 (10=best), which means it is about average compared to other places in Massachusetts.

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

63°F

Today's Weather - Boston, MA

55°F

Average Monthly High / Low (°F)

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

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 Boston with an average high temperature of 82.4°, which ranks it as warmer than most places in Massachusetts. In Boston, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Boston are June, August and July.

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

January has the coldest nighttime temperatures for Boston with an average of 19.2°. This is about average compared to other places in Massachusetts.

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 Boston, there are 11.3 days annually when the high temperature is over 90°, which is hotter than most places in Massachusetts.

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 Boston, there are 116.4 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Massachusetts.

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 Boston, there are 1.8 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Massachusetts.

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.


March is the wettest month in Boston with 4.6 inches of rain, and the driest month is February with 3.5 inches. The wettest season is Summer with 26% of yearly precipitation and 24% occurs in Spring, which is the driest season. The annual rainfall of 47.4 inches in Boston means that it is drier than most places in Massachusetts.

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 Boston with 12.4 days of rain, and September is the driest month with only 8.9 rainy days. There are 130.0 rainy days annually in Boston, which is rainier than most places in Massachusetts. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 23% 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 48.1 inches in Boston means that it is snowier than most places in Massachusetts.

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

January is the snowiest month in Boston with 14.2 inches of snow, and 6 months of the year have significant snowfall.