2025 Compare Climate & Weather:
Granville, OH vs Rock Island, IL

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Highlights

On average, there are 198 sunny days per year in Rock Island. Granville averages 175 sunny days per year. The US average is 205 sunny days.

Rock Island, Illinois gets 37 inches of rain, on average, per year. Granville, Ohio gets 41.5 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Rock Island averages 28.2 inches of snow per year. Granville averages 20.1 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Rock Island, Illinois
Summer High: the July high is around 84.7 degrees
Winter Low: the January low is 14.5
Rain: averages 37 inches of rain a year
Snow: averages 28.2 inches of snow a year

Granville, Ohio
Summer High: the July high is around 84 degrees
Winter Low: the January low is 20
Rain: averages 41.5 inches of rain a year
Snow: averages 20.1 inches of snow a year

BestPlaces Comfort Index

Rock Island

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

6.9 / 10

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

Granville

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

7.1 / 10

June, September and August are the most pleasant months in Granville, while January and February are the least comfortable months.

Average Monthly High / Low (°F)

Month	Granville, OH	Rock Island, IL
January	36° / 20°	31° / 15°
February	40° / 22°	36° / 19°
March	50° / 30°	49° / 30°
April	63° / 39°	62° / 41°
May	72° / 50°	73° / 51°
June	81° / 59°	82° / 61°
July	84° / 62°	85° / 65°
August	83° / 61°	83° / 63°
September	76° / 53°	76° / 54°
October	65° / 41°	64° / 43°
November	52° / 33°	49° / 31°
December	39° / 25°	34° / 19°

Hot, Freezing, Rainy, Snowy Days: Granville / Rock Island

Month	Hot Days	Freezing Days	Rainy Days	Snowy Days
January	0 / 0	26 / 29	12 / 9	5 / 5
February	0 / 0	24 / 25	11 / 8	4 / 4
March	0 / 0	20 / 19	11 / 10	2 / 2
April	0 / 0	7 / 5	12 / 11	0 / 1
May	0 / 1	1 / 0	13 / 12	0 / 0
June	2 / 3	0 / 0	10 / 11	0 / 0
July	4 / 6	0 / 0	10 / 9	0 / 0
August	3 / 4	0 / 0	8 / 10	0 / 0
September	1 / 1	0 / 0	8 / 8	0 / 0
October	0 / 0	5 / 4	9 / 9	0 / 0
November	0 / 0	14 / 16	11 / 10	1 / 1
December	0 / 0	24 / 27	12 / 10	4 / 5

July is the hottest month for Granville with an average high temperature of 84.0°, which ranks it as about average compared to other places in Ohio. In Granville, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Granville are September, June and August.

July is the hottest month for Rock Island with an average high temperature of 84.7°, which ranks it as cooler than most places in Illinois. In Rock Island, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Rock Island are September, June and August.

January has the coldest nighttime temperatures for Granville with an average of 20.0°. This is warmer than most places in Ohio.

January has the coldest nighttime temperatures for Rock Island with an average of 14.5°. This is colder than most places in Illinois.

In Granville, there are 10.6 days annually when the high temperature is over 90°, which is about average compared to other places in Ohio.

In Rock Island, there are 14.9 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.

In Granville, there are 120.0 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Ohio.

In Rock Island, there are 124.5 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Illinois.

In Granville, there are 4.2 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Ohio.

In Rock Island, there are 10.0 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

May is the wettest month in Granville with 4.5 inches of rain, and the driest month is February with 2.5 inches. The wettest season is Autumn with 29% of yearly precipitation and 20% occurs in Spring, which is the driest season. The annual rainfall of 41.5 inches in Granville means that it is wetter than most places in Ohio.

June is the wettest month in Rock Island with 4.6 inches of rain, and the driest month is January with 1.3 inches. The wettest season is Autumn with 36% of yearly precipitation and 13% occurs in Spring, which is the driest season. The annual rainfall of 37.0 inches in Rock Island means that it is drier than most places in Illinois.

May is the rainiest month in Granville with 12.5 days of rain, and August is the driest month with only 8.2 rainy days. There are 127.9 rainy days annually in Granville, which is about average compared to other places in Ohio. 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 Rock Island with 11.7 days of rain, and September is the driest month with only 8.0 rainy days. There are 115.3 rainy days annually in Rock Island, which is rainier than most places in Illinois. The rainiest season is Summer when it rains 28% of the time and the driest is Spring with only a 23% chance of a rainy day.

An annual snowfall of 20.1 inches in Granville means that it is less snowy than most places in Ohio.

An annual snowfall of 28.2 inches in Rock Island means that it is snowier than most places in Illinois.

January is the snowiest month in Granville with 7.2 inches of snow, and 6 months of the year have significant snowfall.

January is the snowiest month in Rock Island with 8.5 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 Granville 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

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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

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Reviews for Rock Island 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:
Granville, OH vs Rock Island, IL

Highlights

Weather Highlights

BestPlaces Comfort Index

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Granville / Rock Island

January has the coldest nighttime temperatures for Granville with an average of 20.0°. This is warmer than most places in Ohio.

January has the coldest nighttime temperatures for Rock Island with an average of 14.5°. This is colder than most places in Illinois.

In Granville, there are 10.6 days annually when the high temperature is over 90°, which is about average compared to other places in Ohio.

In Rock Island, there are 14.9 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.

In Granville, there are 4.2 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Ohio.

In Rock Island, there are 10.0 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

An annual snowfall of 20.1 inches in Granville means that it is less snowy than most places in Ohio.

An annual snowfall of 28.2 inches in Rock Island means that it is snowier than most places in Illinois.

January is the snowiest month in Granville with 7.2 inches of snow, and 6 months of the year have significant snowfall.

January is the snowiest month in Rock Island with 8.5 inches of snow, and 6 months of the year have significant snowfall.

DID YOU KNOW?

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Reviews for Rock Island 2 Reviews

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2025 Compare Climate & Weather:Granville, OH vs Rock Island, IL

Highlights

Weather Highlights

BestPlaces Comfort Index

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Granville / Rock Island

January has the coldest nighttime temperatures for Granville with an average of 20.0°. This is warmer than most places in Ohio.January has the coldest nighttime temperatures for Rock Island with an average of 14.5°. This is colder than most places in Illinois.

In Granville, there are 10.6 days annually when the high temperature is over 90°, which is about average compared to other places in Ohio.In Rock Island, there are 14.9 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.

In Granville, there are 4.2 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Ohio.In Rock Island, there are 10.0 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

An annual snowfall of 20.1 inches in Granville means that it is less snowy than most places in Ohio.An annual snowfall of 28.2 inches in Rock Island means that it is snowier than most places in Illinois.

January is the snowiest month in Granville with 7.2 inches of snow, and 6 months of the year have significant snowfall.January is the snowiest month in Rock Island with 8.5 inches of snow, and 6 months of the year have significant snowfall.

DID YOU KNOW?

Reviews for Granville 2 Reviews

Reviews for Rock Island 2 Reviews

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2025 Compare Climate & Weather:
Granville, OH vs Rock Island, IL

January has the coldest nighttime temperatures for Granville with an average of 20.0°. This is warmer than most places in Ohio.

January has the coldest nighttime temperatures for Rock Island with an average of 14.5°. This is colder than most places in Illinois.

In Granville, there are 10.6 days annually when the high temperature is over 90°, which is about average compared to other places in Ohio.

In Rock Island, there are 14.9 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.

An annual snowfall of 20.1 inches in Granville means that it is less snowy than most places in Ohio.

An annual snowfall of 28.2 inches in Rock Island means that it is snowier than most places in Illinois.

January is the snowiest month in Granville with 7.2 inches of snow, and 6 months of the year have significant snowfall.

January is the snowiest month in Rock Island with 8.5 inches of snow, and 6 months of the year have significant snowfall.