2025 Compare Climate & Weather:
St. Louis, MO vs Swansea, MA

Highlights

On average, there are 201 sunny days per year in Swansea. St. Louis averages 202 sunny days per year. The US average is 205 sunny days.

Swansea, Massachusetts gets 48.2 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.

Swansea averages 32.9 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

Swansea, Massachusetts
Summer High: the July high is around 82.7 degrees
Winter Low: the January low is 20.6
Rain: averages 48.2 inches of rain a year
Snow: averages 32.9 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 Swansea is 7.1 (10=best), which means it is one of the most pleasant places in Massachusetts.

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

70°F

Today's Weather - Swansea, MA

57°F

Average Monthly High / Low (°F)

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

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 Swansea with an average high temperature of 82.7°, which ranks it as warmer than most places in Massachusetts. In Swansea, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Swansea are June, September and August.

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 Swansea with an average of 20.6°. This is warmer than most places in Massachusetts.

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 Swansea, there are 8.3 days annually when the high temperature is over 90°, which is hotter than most places in Massachusetts.

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 Swansea, there are 110.8 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Massachusetts.

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 Swansea, there are 1.0 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Massachusetts.

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.


March is the wettest month in Swansea with 5.2 inches of rain, and the driest month is July with 3.3 inches. The wettest season is Summer with 28% of yearly precipitation and 22% occurs in Autumn, which is the driest season. The annual rainfall of 48.2 inches in Swansea means that it is about average compared to other places in Massachusetts.

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.

May is the rainiest month in Swansea with 12.0 days of rain, and September is the driest month with only 8.8 rainy days. There are 123.6 rainy days annually in Swansea, which is about average compared to other 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 15.5 inches in St. Louis means that it is snowier than most places in Missouri.

An annual snowfall of 32.9 inches in Swansea means that it is less snowy than most places in Massachusetts.

January is the snowiest month in St. Louis with 4.9 inches of snow, and 5 months of the year have significant snowfall.

January is the snowiest month in Swansea with 9.0 inches of snow, and 6 months of the year have significant snowfall.