2025 Compare Climate & Weather:
Rapid City, SD vs West Chicago, IL

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Highlights

On average, there are 187 sunny days per year in West Chicago. Rapid City averages 226 sunny days per year. The US average is 205 sunny days.

West Chicago, Illinois gets 37.8 inches of rain, on average, per year. Rapid City, South Dakota gets 18.2 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

West Chicago averages 30.5 inches of snow per year. Rapid City averages 38 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

West Chicago, Illinois
Summer High: the July high is around 85.2 degrees
Winter Low: the January low is 13.7
Rain: averages 37.8 inches of rain a year
Snow: averages 30.5 inches of snow a year

Rapid City, South Dakota
Summer High: the July high is around 85.3 degrees
Winter Low: the January low is 14.2
Rain: averages 18.2 inches of rain a year
Snow: averages 38 inches of snow a year

BestPlaces Comfort Index

West Chicago

The annual BestPlaces Comfort Index for West Chicago is 6.8 (10=best), which means it is less comfortable than most places in Illinois.

6.8 / 10

June, September and August are the most pleasant months in West Chicago, while January and December are the least comfortable months.

Rapid City

The annual BestPlaces Comfort Index for Rapid City is 7.0 (10=best), which means it is one of the most pleasant places in South Dakota.

7 / 10

August, July and June are the most pleasant months in Rapid City, while February and January are the least comfortable months.

Average Monthly High / Low (°F)

Month	Rapid City, SD	West Chicago, IL
January	38° / 14°	31° / 14°
February	39° / 16°	36° / 17°
March	47° / 23°	48° / 26°
April	57° / 32°	61° / 36°
May	67° / 43°	71° / 46°
June	76° / 52°	82° / 57°
July	85° / 59°	85° / 61°
August	85° / 58°	83° / 60°
September	74° / 47°	76° / 51°
October	60° / 35°	63° / 39°
November	47° / 24°	49° / 29°
December	37° / 15°	35° / 18°

Hot, Freezing, Rainy, Snowy Days: Rapid City / West Chicago

Month	Hot Days	Freezing Days	Rainy Days	Snowy Days
January	0 / 0	29 / 29	4 / 10	5 / 7
February	0 / 0	26 / 26	5 / 8	5 / 5
March	0 / 0	25 / 23	6 / 10	4 / 3
April	0 / 0	15 / 10	9 / 12	3 / 1
May	0 / 1	3 / 2	11 / 12	0 / 0
June	2 / 4	0 / 0	12 / 11	0 / 0
July	9 / 6	0 / 0	9 / 9	0 / 0
August	8 / 4	0 / 0	8 / 10	0 / 0
September	2 / 1	1 / 0	6 / 8	0 / 0
October	0 / 0	10 / 7	7 / 10	1 / 0
November	0 / 0	23 / 19	4 / 10	3 / 1
December	0 / 0	29 / 28	4 / 11	4 / 6

July is the hottest month for Rapid City with an average high temperature of 85.3°, which ranks it as about average compared to other places in South Dakota. In Rapid City, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Rapid City are June, September and August.

July is the hottest month for West Chicago with an average high temperature of 85.2°, which ranks it as about average compared to other places in Illinois. In West Chicago, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for West Chicago are September, June and August.

January has the coldest nighttime temperatures for Rapid City with an average of 14.2°. This is one of the warmest places in South Dakota.

January has the coldest nighttime temperatures for West Chicago with an average of 13.7°. This is colder than most places in Illinois.

In Rapid City, there are 22.5 days annually when the high temperature is over 90°, which is about average compared to other places in South Dakota.

In West Chicago, there are 16.3 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.

In Rapid City, there are 159.6 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in South Dakota.

In West Chicago, there are 143.8 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in Illinois.

In Rapid City, there are 14.9 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in South Dakota.

In West Chicago, there are 8.5 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

May is the wettest month in Rapid City with 3.8 inches of rain, and the driest month is January with 0.3 inches. The wettest season is Autumn with 38% of yearly precipitation and 6% occurs in Spring, which is the driest season. The annual rainfall of 18.2 inches in Rapid City means that it is drier than most places in South Dakota.

August is the wettest month in West Chicago with 4.5 inches of rain, and the driest month is January with 1.6 inches. The wettest season is Autumn with 34% of yearly precipitation and 14% occurs in Spring, which is the driest season. The annual rainfall of 37.8 inches in West Chicago means that it is drier than most places in Illinois.

June is the rainiest month in Rapid City with 11.8 days of rain, and November is the driest month with only 4.0 rainy days. There are 85.4 rainy days annually in Rapid City, which is rainier than most places in South Dakota. The rainiest season is Autumn when it rains 34% of the time and the driest is Spring with only a 15% chance of a rainy day.

May is the rainiest month in West Chicago with 12.0 days of rain, and February is the driest month with only 7.9 rainy days. There are 119.0 rainy days annually in West Chicago, which is rainier than most places in Illinois. 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 38.0 inches in Rapid City means that it is about average compared to other places in South Dakota.

An annual snowfall of 30.5 inches in West Chicago means that it is snowier than most places in Illinois.

March is the snowiest month in Rapid City with 8.6 inches of snow, and 8 months of the year have significant snowfall.

January is the snowiest month in West Chicago with 10.3 inches of snow, and 6 months of the year have significant snowfall.

DID YOU KNOW?

Many people confuse Weather and Climate, but they are different. Weather refers to the conditions of the atmosphere over a short period of time, while Climate refers to the conditions of the atmosphere over a long period of time.

Weather, more specifically, refers to how the atmosphere behaves and its effects on life and human activities. Most people think of Weather in terms of what can be observed: temperature, humidity, precipitation, and cloudy/sunny conditions. Weather conditions constantly change on a minute-to-minute basis.

Climate is a record of the average weather conditions for a given place over a long period of time, often referred to as Climate Normals. A 30-year period of record is a common requirement to be considered a Climate Normal.

Reviews for Rapid City 2 Reviews

Jill · Sherman Oaks, CA

re:

Over 16 years ago

Hi. I'd like to know if you still feel the same way about living in Broomfield. I went there this past July to check it out (along with Lafayette, Boulder (can't More

| Reply

NC For Me · Apex, NC

re:

Over 16 years ago

Apex is perfect for what you are looking for. It's close enough to Raleigh, Durham, Chapel Hill to find a job and Cary the next town over, is a little more expensive but More

| Reply

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Reviews for West Chicago 2 Reviews

Jill · Sherman Oaks, CA

re:

Over 16 years ago

Hi. I'd like to know if you still feel the same way about living in Broomfield. I went there this past July to check it out (along with Lafayette, Boulder (can't More

| Reply

NC For Me · Apex, NC

re:

Over 16 years ago

Apex is perfect for what you are looking for. It's close enough to Raleigh, Durham, Chapel Hill to find a job and Cary the next town over, is a little more expensive but More

| Reply

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2025 Compare Climate & Weather:
Rapid City, SD vs West Chicago, IL

Highlights

Weather Highlights

BestPlaces Comfort Index

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Rapid City / West Chicago

January has the coldest nighttime temperatures for Rapid City with an average of 14.2°. This is one of the warmest places in South Dakota.

January has the coldest nighttime temperatures for West Chicago with an average of 13.7°. This is colder than most places in Illinois.

In Rapid City, there are 22.5 days annually when the high temperature is over 90°, which is about average compared to other places in South Dakota.

In West Chicago, there are 16.3 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.

In Rapid City, there are 14.9 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in South Dakota.

In West Chicago, there are 8.5 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

An annual snowfall of 38.0 inches in Rapid City means that it is about average compared to other places in South Dakota.

An annual snowfall of 30.5 inches in West Chicago means that it is snowier than most places in Illinois.

March is the snowiest month in Rapid City with 8.6 inches of snow, and 8 months of the year have significant snowfall.

January is the snowiest month in West Chicago with 10.3 inches of snow, and 6 months of the year have significant snowfall.

DID YOU KNOW?

Reviews for Rapid City 2 Reviews

Reviews for West Chicago 2 Reviews

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2025 Compare Climate & Weather:Rapid City, SD vs West Chicago, IL

Highlights

Weather Highlights

BestPlaces Comfort Index

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Rapid City / West Chicago

January has the coldest nighttime temperatures for Rapid City with an average of 14.2°. This is one of the warmest places in South Dakota.January has the coldest nighttime temperatures for West Chicago with an average of 13.7°. This is colder than most places in Illinois.

In Rapid City, there are 22.5 days annually when the high temperature is over 90°, which is about average compared to other places in South Dakota.In West Chicago, there are 16.3 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.

In Rapid City, there are 14.9 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in South Dakota.In West Chicago, there are 8.5 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

An annual snowfall of 38.0 inches in Rapid City means that it is about average compared to other places in South Dakota.An annual snowfall of 30.5 inches in West Chicago means that it is snowier than most places in Illinois.

March is the snowiest month in Rapid City with 8.6 inches of snow, and 8 months of the year have significant snowfall.January is the snowiest month in West Chicago with 10.3 inches of snow, and 6 months of the year have significant snowfall.

DID YOU KNOW?

Reviews for Rapid City 2 Reviews

Reviews for West Chicago 2 Reviews

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2025 Compare Climate & Weather:
Rapid City, SD vs West Chicago, IL

January has the coldest nighttime temperatures for Rapid City with an average of 14.2°. This is one of the warmest places in South Dakota.

January has the coldest nighttime temperatures for West Chicago with an average of 13.7°. This is colder than most places in Illinois.

In Rapid City, there are 22.5 days annually when the high temperature is over 90°, which is about average compared to other places in South Dakota.

In West Chicago, there are 16.3 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.

In Rapid City, there are 14.9 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in South Dakota.

In West Chicago, there are 8.5 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

An annual snowfall of 38.0 inches in Rapid City means that it is about average compared to other places in South Dakota.

An annual snowfall of 30.5 inches in West Chicago means that it is snowier than most places in Illinois.

March is the snowiest month in Rapid City with 8.6 inches of snow, and 8 months of the year have significant snowfall.

January is the snowiest month in West Chicago with 10.3 inches of snow, and 6 months of the year have significant snowfall.