2025 Compare Climate & Weather:
Joliet, IL vs Sioux Falls, SD

Highlights

On average, there are 211 sunny days per year in Sioux Falls. Joliet averages 186 sunny days per year. The US average is 205 sunny days.

Sioux Falls, South Dakota gets 26.7 inches of rain, on average, per year. Joliet, Illinois gets 39 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Sioux Falls averages 37.6 inches of snow per year. Joliet averages 27.7 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

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

Joliet, Illinois
Summer High: the July high is around 84.3 degrees
Winter Low: the January low is 16
Rain: averages 39 inches of rain a year
Snow: averages 27.7 inches of snow a year

BestPlaces Comfort Index

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.

The annual BestPlaces Comfort Index for Joliet is 6.9 (10=best), which means it is less comfortable than most places in Illinois.

Today's Weather - Joliet, IL

54°F

Today's Weather - Sioux Falls, SD

68°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Joliet / Sioux Falls

July is the hottest month for Joliet with an average high temperature of 84.3°, which ranks it as cooler than most places in Illinois. In Joliet, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Joliet are September, June and August.

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.

January has the coldest nighttime temperatures for Joliet with an average of 16.0°. This is about average compared to other places in Illinois.

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.

In Joliet, there are 12.5 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.

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 Joliet, there are 123.2 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Illinois.

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 Joliet, there are 7.1 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Illinois.

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.

July is the wettest month in Joliet with 4.6 inches of rain, and the driest month is January with 1.8 inches. The wettest season is Autumn with 33% of yearly precipitation and 15% occurs in Spring, which is the driest season. The annual rainfall of 39.0 inches in Joliet means that it is about average compared to other places in Illinois.


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.

May is the rainiest month in Joliet with 12.4 days of rain, and September is the driest month with only 7.8 rainy days. There are 124.6 rainy days annually in Joliet, which is one of the rainiest places in Illinois. 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.

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.

An annual snowfall of 27.7 inches in Joliet means that it is snowier than most places in Illinois.

An annual snowfall of 37.6 inches in Sioux Falls means that it is about average compared to other places in South Dakota.

December is the snowiest month in Joliet with 8.6 inches of snow, and 5 months of the year have significant snowfall.

December is the snowiest month in Sioux Falls with 7.0 inches of snow, and 7 months of the year have significant snowfall.