2025 Compare Climate & Weather:
Sioux Falls, SD vs Round Rock, TX

Highlights

On average, there are 232 sunny days per year in Round Rock. Sioux Falls averages 211 sunny days per year. The US average is 205 sunny days.

Round Rock, Texas gets 36 inches of rain, on average, per year. Sioux Falls, South Dakota gets 26.7 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. Sioux Falls averages 37.6 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

Sioux Falls, South Dakota
Summer High: the July high is around 83.5 degrees
Winter Low: the January low is 6.3
Rain: averages 26.7 inches of rain a year
Snow: averages 37.6 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 Sioux Falls is 6.8 (10=best), which means it is about average compared to other places in South Dakota.

Today's Weather - Sioux Falls, SD

80°F

Today's Weather - Round Rock, TX

76°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Sioux Falls / Round Rock

July is the hottest month for Sioux Falls with an average high temperature of 83.5°, which ranks it as cooler than most places in South Dakota. In Sioux Falls, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Sioux Falls are June, August and September.

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 Sioux Falls with an average of 6.3°. This is about average compared to other places in South Dakota.

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 Sioux Falls, there are 11.2 days annually when the high temperature is over 90°, which is cooler than most places in South Dakota.

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 Sioux Falls, there are 161.6 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in South Dakota.

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 Sioux Falls, there are 26.3 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in South Dakota.

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.

June is the wettest month in Sioux Falls with 4.0 inches of rain, and the driest month is January with 0.6 inches. The wettest season is Autumn with 38% of yearly precipitation and 7% occurs in Spring, which is the driest season. The annual rainfall of 26.7 inches in Sioux Falls means that it is wetter than most places in South Dakota.


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 Sioux Falls with 10.8 days of rain, and February is the driest month with only 5.1 rainy days. There are 90.1 rainy days annually in Sioux Falls, which is one of the rainiest places in South Dakota. The rainiest season is Autumn when it rains 30% of the time and the driest is Spring with only a 17% 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 37.6 inches in Sioux Falls means that it is about average compared to other places in South Dakota.

An annual snowfall of 0.2 inches in Round Rock means that it is about average compared to other places in Texas.

December is the snowiest month in Sioux Falls with 7.0 inches of snow, and 7 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.