2025 Compare Climate & Weather:
Bloomington, IL vs Alton, IL

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Highlights

On average, there are 200 sunny days per year in Alton. Bloomington averages 194 sunny days per year. The US average is 205 sunny days.

Alton, Illinois gets 41.7 inches of rain, on average, per year. Bloomington, Illinois gets 39.4 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Alton averages 15.5 inches of snow per year. Bloomington averages 21 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Alton, Illinois
Summer High: the July high is around 88.7 degrees
Winter Low: the January low is 22.7
Rain: averages 41.7 inches of rain a year
Snow: averages 15.5 inches of snow a year

Bloomington, Illinois
Summer High: the July high is around 85.6 degrees
Winter Low: the January low is 15
Rain: averages 39.4 inches of rain a year
Snow: averages 21 inches of snow a year

BestPlaces Comfort Index

Alton

The annual BestPlaces Comfort Index for Alton is 7.2 (10=best), which means it is one of the most pleasant places in Illinois.

7.2 / 10

September, May and October are the most pleasant months in Alton, while January and December are the least comfortable months.

Bloomington

The annual BestPlaces Comfort Index for Bloomington is 7.0 (10=best), which means it is about average compared to other places in Illinois.

7 / 10

September, June and May are the most pleasant months in Bloomington, while January and December are the least comfortable months.

Average Monthly High / Low (°F)

Month	Bloomington, IL	Alton, IL
January	33° / 15°	40° / 23°
February	38° / 19°	44° / 27°
March	50° / 28°	55° / 36°
April	63° / 39°	67° / 46°
May	74° / 50°	76° / 56°
June	83° / 59°	85° / 66°
July	86° / 63°	89° / 70°
August	84° / 61°	88° / 68°
September	78° / 52°	80° / 59°
October	65° / 41°	69° / 47°
November	50° / 31°	55° / 37°
December	36° / 19°	42° / 26°

Hot, Freezing, Rainy, Snowy Days: Bloomington / Alton

Month	Hot Days	Freezing Days	Rainy Days	Snowy Days
January	0 / 0	29 / 25	7 / 8	4 / 3
February	0 / 0	25 / 19	7 / 8	3 / 3
March	0 / 0	21 / 11	9 / 10	1 / 1
April	0 / 0	7 / 2	11 / 11	0 / 0
May	1 / 1	1 / 0	11 / 11	0 / 0
June	4 / 8	0 / 0	10 / 9	0 / 0
July	7 / 14	0 / 0	8 / 8	0 / 0
August	5 / 11	0 / 0	8 / 8	0 / 0
September	2 / 4	0 / 0	7 / 7	0 / 0
October	0 / 0	5 / 1	9 / 9	0 / 0
November	0 / 0	17 / 9	9 / 9	1 / 0
December	0 / 0	27 / 22	9 / 9	4 / 3

July is the hottest month for Bloomington with an average high temperature of 85.6°, which ranks it as about average compared to other places in Illinois. In Bloomington, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Bloomington are September, May and June.

July is the hottest month for Alton with an average high temperature of 88.7°, which ranks it as one of the hottest places in Illinois. In Alton, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Alton are May, September and June.

January has the coldest nighttime temperatures for Bloomington with an average of 15.0°. This is colder than most places in Illinois.

January has the coldest nighttime temperatures for Alton with an average of 22.7°. This is one of the warmest places in Illinois.

In Bloomington, there are 19.7 days annually when the high temperature is over 90°, which is about average compared to other places in Illinois.

In Alton, there are 37.1 days annually when the high temperature is over 90°, which is one of the hottest places in Illinois.

In Bloomington, there are 131.7 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.

In Alton, there are 87.9 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Illinois.

In Bloomington, there are 8.0 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

In Alton, there are 1.7 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Illinois.

May is the wettest month in Bloomington with 4.5 inches of rain, and the driest month is February with 1.9 inches. The wettest season is Autumn with 31% of yearly precipitation and 17% occurs in Spring, which is the driest season. The annual rainfall of 39.4 inches in Bloomington means that it is about average compared to other places in Illinois.

May is the wettest month in Alton with 5.0 inches of rain, and the driest month is January with 2.4 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 41.7 inches in Alton means that it is wetter than most places in Illinois.

May is the rainiest month in Bloomington with 10.7 days of rain, and February is the driest month with only 6.9 rainy days. There are 104.9 rainy days annually in Bloomington, which is about average compared to other places in Illinois. The rainiest season is Summer when it rains 29% of the time and the driest is Spring with only a 22% chance of a rainy day.

May is the rainiest month in Alton with 11.3 days of rain, and September is the driest month with only 7.0 rainy days. There are 104.2 rainy days annually in Alton, which is less rainy than most places in Illinois. The rainiest season is Summer when it rains 30% of the time and the driest is Spring with only a 22% chance of a rainy day.

An annual snowfall of 21.0 inches in Bloomington means that it is about average compared to other places in Illinois.

An annual snowfall of 15.5 inches in Alton means that it is less snowy than most places in Illinois.

January is the snowiest month in Bloomington with 6.7 inches of snow, and 6 months of the year have significant snowfall.

January is the snowiest month in Alton with 4.8 inches of snow, and 5 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 Bloomington 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 Alton 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

Start Your Review of Alton

See all reviews

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2025 Compare Climate & Weather:
Bloomington, IL vs Alton, IL

Highlights

Weather Highlights

BestPlaces Comfort Index

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Bloomington / Alton

January has the coldest nighttime temperatures for Bloomington with an average of 15.0°. This is colder than most places in Illinois.

January has the coldest nighttime temperatures for Alton with an average of 22.7°. This is one of the warmest places in Illinois.

In Bloomington, there are 19.7 days annually when the high temperature is over 90°, which is about average compared to other places in Illinois.

In Alton, there are 37.1 days annually when the high temperature is over 90°, which is one of the hottest places in Illinois.

In Bloomington, there are 131.7 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.

In Alton, there are 87.9 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Illinois.

In Bloomington, there are 8.0 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

In Alton, there are 1.7 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Illinois.

An annual snowfall of 21.0 inches in Bloomington means that it is about average compared to other places in Illinois.

An annual snowfall of 15.5 inches in Alton means that it is less snowy than most places in Illinois.

January is the snowiest month in Bloomington with 6.7 inches of snow, and 6 months of the year have significant snowfall.

January is the snowiest month in Alton with 4.8 inches of snow, and 5 months of the year have significant snowfall.

DID YOU KNOW?

Reviews for Bloomington 2 Reviews

Reviews for Alton 2 Reviews

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2025 Compare Climate & Weather:Bloomington, IL vs Alton, IL

Highlights

Weather Highlights

BestPlaces Comfort Index

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Bloomington / Alton

January has the coldest nighttime temperatures for Bloomington with an average of 15.0°. This is colder than most places in Illinois.January has the coldest nighttime temperatures for Alton with an average of 22.7°. This is one of the warmest places in Illinois.

In Bloomington, there are 19.7 days annually when the high temperature is over 90°, which is about average compared to other places in Illinois.In Alton, there are 37.1 days annually when the high temperature is over 90°, which is one of the hottest places in Illinois.

In Bloomington, there are 131.7 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.In Alton, there are 87.9 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Illinois.

In Bloomington, there are 8.0 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.In Alton, there are 1.7 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Illinois.

An annual snowfall of 21.0 inches in Bloomington means that it is about average compared to other places in Illinois.An annual snowfall of 15.5 inches in Alton means that it is less snowy than most places in Illinois.

January is the snowiest month in Bloomington with 6.7 inches of snow, and 6 months of the year have significant snowfall.January is the snowiest month in Alton with 4.8 inches of snow, and 5 months of the year have significant snowfall.

DID YOU KNOW?

Reviews for Bloomington 2 Reviews

Reviews for Alton 2 Reviews

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Zips In Bloomington, Illinois

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2025 Compare Climate & Weather:
Bloomington, IL vs Alton, IL

January has the coldest nighttime temperatures for Bloomington with an average of 15.0°. This is colder than most places in Illinois.

January has the coldest nighttime temperatures for Alton with an average of 22.7°. This is one of the warmest places in Illinois.

In Bloomington, there are 19.7 days annually when the high temperature is over 90°, which is about average compared to other places in Illinois.

In Alton, there are 37.1 days annually when the high temperature is over 90°, which is one of the hottest places in Illinois.

In Bloomington, there are 131.7 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.

In Alton, there are 87.9 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Illinois.

In Bloomington, there are 8.0 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

In Alton, there are 1.7 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Illinois.

An annual snowfall of 21.0 inches in Bloomington means that it is about average compared to other places in Illinois.

An annual snowfall of 15.5 inches in Alton means that it is less snowy than most places in Illinois.

January is the snowiest month in Bloomington with 6.7 inches of snow, and 6 months of the year have significant snowfall.

January is the snowiest month in Alton with 4.8 inches of snow, and 5 months of the year have significant snowfall.