The remote server returned an error: (400) Bad Request.The remote server returned an error: (400) Bad Request. 2025 Compare Climate & Weather: Naperville, IL vs Bethlehem, PA

2025 Compare Climate & Weather:
Naperville, IL vs Bethlehem, PA

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Highlights

On average, there are 202 sunny days per year in Bethlehem. Naperville averages 189 sunny days per year. The US average is 205 sunny days.

Bethlehem, Pennsylvania gets 48 inches of rain, on average, per year. Naperville, Illinois gets 38.6 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Bethlehem averages 30.4 inches of snow per year. Naperville averages 28.7 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Bethlehem, Pennsylvania
Summer High: the July high is around 84.3 degrees
Winter Low: the January low is 18.5
Rain: averages 48 inches of rain a year
Snow: averages 30.4 inches of snow a year

Naperville, Illinois
Summer High: the July high is around 83.8 degrees
Winter Low: the January low is 15.1
Rain: averages 38.6 inches of rain a year
Snow: averages 28.7 inches of snow a year

BestPlaces Comfort Index
Bethlehem

The annual BestPlaces Comfort Index for Bethlehem is 7.1 (10=best), which means it is more comfortable than most places in Pennsylvania.

7.1 / 10
June, September and August are the most pleasant months in Bethlehem, while January and February are the least comfortable months.

Naperville

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

6.9 / 10
June, September and August are the most pleasant months in Naperville, while January and December are the least comfortable months.

Average Monthly High / Low (°F)
MonthNaperville, ILBethlehem, PA
January31° / 15°37° / 19°
February35° / 18°41° / 20°
March47° / 27°50° / 27°
April60° / 38°62° / 38°
May70° / 48°72° / 47°
June80° / 59°80° / 57°
July84° / 63°84° / 62°
August81° / 61°83° / 60°
September75° / 52°76° / 52°
October63° / 41°64° / 40°
November48° / 30°53° / 32°
December35° / 19°41° / 23°
Hot, Freezing, Rainy, Snowy Days: Naperville / Bethlehem
MonthHot DaysFreezing DaysRainy DaysSnowy Days
January0 / 028 / 2910 / 106 / 5
February0 / 025 / 269 / 95 / 4
March0 / 022 / 2211 / 103 / 2
April0 / 08 / 711 / 110 / 1
May0 / 10 / 112 / 120 / 0
June2 / 20 / 011 / 110 / 0
July3 / 50 / 010 / 100 / 0
August2 / 30 / 010 / 90 / 0
September1 / 10 / 08 / 90 / 0
October0 / 06 / 69 / 90 / 0
November0 / 019 / 1510 / 91 / 1
December0 / 028 / 2611 / 106 / 3
July is the hottest month for Naperville with an average high temperature of 83.8°, which ranks it as cooler than most places in Illinois. In Naperville, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Naperville are June, September and August.

July is the hottest month for Bethlehem with an average high temperature of 84.3°, which ranks it as warmer than most places in Pennsylvania. In Bethlehem, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Bethlehem are June, September and August.
January has the coldest nighttime temperatures for Naperville with an average of 15.1°. This is colder than most places in Illinois.

January has the coldest nighttime temperatures for Bethlehem with an average of 18.5°. This is about average compared to other places in Pennsylvania.

In Naperville, there are 8.6 days annually when the high temperature is over 90°, which is one of the coolest places in Illinois.

In Bethlehem, there are 12.2 days annually when the high temperature is over 90°, which is hotter than most places in Pennsylvania.

In Naperville, there are 135.4 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.

In Bethlehem, there are 130.9 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Pennsylvania.

In Naperville, there are 6.1 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Illinois.

In Bethlehem, there are 2.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Pennsylvania.

August is the wettest month in Naperville with 4.2 inches of rain, and the driest month is January with 1.9 inches. The wettest season is Autumn with 32% of yearly precipitation and 16% occurs in Spring, which is the driest season. The annual rainfall of 38.6 inches in Naperville means that it is about average compared to other places in Illinois.


July is the wettest month in Bethlehem with 5.1 inches of rain, and the driest month is February with 2.9 inches. The wettest season is Autumn with 28% of yearly precipitation and 21% occurs in Spring, which is the driest season. The annual rainfall of 48.0 inches in Bethlehem means that it is one of the wettest places in Pennsylvania.

May is the rainiest month in Naperville with 12.0 days of rain, and September is the driest month with only 7.9 rainy days. There are 120.3 rainy days annually in Naperville, 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 22% chance of a rainy day.

May is the rainiest month in Bethlehem with 11.7 days of rain, and February is the driest month with only 8.7 rainy days. There are 119.6 rainy days annually in Bethlehem, which is less rainy than most places in Pennsylvania. The rainiest season is Summer when it rains 27% of the time and the driest is Winter with only a 23% chance of a rainy day.

An annual snowfall of 28.7 inches in Naperville means that it is snowier than most places in Illinois.

An annual snowfall of 30.4 inches in Bethlehem means that it is about average compared to other places in Pennsylvania.
January is the snowiest month in Naperville with 9.1 inches of snow, and 6 months of the year have significant snowfall.

February is the snowiest month in Bethlehem 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 Naperville    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 Naperville

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Reviews for Bethlehem    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 Bethlehem

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Zips In Naperville, Illinois
60540, 60565, 60563
Zips In BETHLEHEM, PENNSYLVANIA
18017, 18015, 18018
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