2025 Compare Climate & Weather:
St. Louis, MO vs Philadelphia, PA

Highlights

On average, there are 207 sunny days per year in Philadelphia. St. Louis averages 202 sunny days per year. The US average is 205 sunny days.

Philadelphia, Pennsylvania gets 47.2 inches of rain, on average, per year. St. Louis, Missouri gets 42.2 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. St. Louis averages 15.5 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

St. Louis, Missouri
Summer High: the July high is around 88.5 degrees
Winter Low: the January low is 22.8
Rain: averages 42.2 inches of rain a year
Snow: averages 15.5 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 St. Louis is 7.2 (10=best), which means it is more comfortable than most places in Missouri.

Today's Weather - St. Louis, MO

64°F

Today's Weather - Philadelphia, PA

73°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: St. Louis / Philadelphia

July is the hottest month for St. Louis with an average high temperature of 88.5°, which ranks it as about average compared to other places in Missouri. In St. Louis, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for St. Louis are May, September and June.

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 St. Louis with an average of 22.8°. This is warmer than most places in Missouri.

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

In St. Louis, there are 36.0 days annually when the high temperature is over 90°, which is hotter than most places in Missouri.

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 St. Louis, there are 91.1 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Missouri.

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 St. Louis, there are 1.5 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Missouri.

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 St. Louis with 4.8 inches of rain, and the driest month is February with 2.3 inches. The wettest season is Summer with 29% of yearly precipitation and 18% occurs in Spring, which is the driest season. The annual rainfall of 42.2 inches in St. Louis means that it is drier than most places in Missouri.


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 St. Louis with 11.3 days of rain, and September is the driest month with only 7.0 rainy days. There are 105.3 rainy days annually in St. Louis, which is rainier than most places in Missouri. The rainiest season is Summer when it rains 30% of the time and the driest is Spring with only a 23% 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 15.5 inches in St. Louis means that it is snowier than most places in Missouri.

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

January is the snowiest month in St. Louis with 4.9 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.