2025 Compare Climate & Weather:
Fairfax, VA vs Philadelphia, PA

Highlights

On average, there are 207 sunny days per year in Philadelphia. Fairfax averages 198 sunny days per year. The US average is 205 sunny days.

Philadelphia, Pennsylvania gets 47.2 inches of rain, on average, per year. Fairfax, Virginia gets 43 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Philadelphia averages 13.1 inches of snow per year. Fairfax averages 21.5 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

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

Fairfax, Virginia
Summer High: the July high is around 85.7 degrees
Winter Low: the January low is 23.7
Rain: averages 43 inches of rain a year
Snow: averages 21.5 inches of snow a year

BestPlaces Comfort Index

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

The annual BestPlaces Comfort Index for Fairfax is 7.3 (10=best), which means it is about average compared to other places in Virginia.

Today's Weather - Fairfax, VA

72°F

Today's Weather - Philadelphia, PA

71°F

Average Monthly High / Low (°F)

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

July is the hottest month for Fairfax with an average high temperature of 85.7°, which ranks it as cooler than most places in Virginia. In Fairfax, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Fairfax are September, June and May.

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.

January has the coldest nighttime temperatures for Fairfax with an average of 23.7°. This is about average compared to other places in Virginia.

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

In Fairfax, there are 18.6 days annually when the high temperature is over 90°, which is cooler than most places in Virginia.

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 Fairfax, there are 102.5 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Virginia.

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 Fairfax, there are 0.6 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Virginia.

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.

May is the wettest month in Fairfax with 4.6 inches of rain, and the driest month is February with 2.8 inches. The wettest season is Summer with 27% of yearly precipitation and 20% occurs in Spring, which is the driest season. The annual rainfall of 43.0 inches in Fairfax means that it is drier than most places in Virginia.


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 rainiest month in Fairfax with 12.2 days of rain, and October is the driest month with only 8.2 rainy days. There are 119.2 rainy days annually in Fairfax, which is rainier than most places in Virginia. 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.

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.

An annual snowfall of 21.5 inches in Fairfax means that it is one of the snowiest places in Virginia.

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

February is the snowiest month in Fairfax with 7.8 inches of snow, and 5 months of the year have significant snowfall.

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