2025 Compare Climate & Weather:
St. Louis, MO vs Round Rock, TX

Highlights

On average, there are 232 sunny days per year in Round Rock. St. Louis averages 202 sunny days per year. The US average is 205 sunny days.

Round Rock, Texas gets 36 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.

Round Rock averages 0.2 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

Round Rock, Texas
Summer High: the July high is around 95 degrees
Winter Low: the January low is 38
Rain: averages 36 inches of rain a year
Snow: averages 0.2 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 Round Rock is 7.2 (10=best), which means it is more comfortable than most places in Texas.

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

67°F

Today's Weather - Round Rock, TX

64°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: St. Louis / Round Rock

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.

August is the hottest month for Round Rock with an average high temperature of 96.3°, which ranks it as warmer than most places in Texas. In Round Rock, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Round Rock are April, October and March.

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 Round Rock with an average of 38.0°. This is about average compared to other places in Texas.

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 Round Rock, there are 104.7 days annually when the high temperature is over 90°, which is hotter than most places in Texas.

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 Round Rock, there are 22.7 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Texas.

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 Round Rock, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Texas.

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.


June is the wettest month in Round Rock with 4.6 inches of rain, and the driest month is January with 2.2 inches. The wettest season is Winter with 28% of yearly precipitation and 19% occurs in Spring, which is the driest season. The annual rainfall of 36.0 inches in Round Rock means that it is about average compared to other places in Texas.

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.

March is the rainiest month in Round Rock with 8.3 days of rain, and August is the driest month with only 4.4 rainy days. There are 78.4 rainy days annually in Round Rock, which is rainier than most places in Texas. The rainiest season is Summer when it rains 29% of the time and the driest is Autumn with only a 21% 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 0.2 inches in Round Rock means that it is about average compared to other places in Texas.

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 Round Rock with 0.1 inches of snow, and no months of the year have significant snowfall.