2025 Compare Climate & Weather:
McHenry, IL vs Alpharetta, GA

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Highlights

On average, there are 218 sunny days per year in Alpharetta. McHenry averages 189 sunny days per year. The US average is 205 sunny days.

Alpharetta, Georgia gets 53.4 inches of rain, on average, per year. McHenry, Illinois gets 36.1 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Alpharetta averages 1.6 inches of snow per year. McHenry averages 37.4 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Alpharetta, Georgia
Summer High: the July high is around 87.9 degrees
Winter Low: the January low is 30
Rain: averages 53.4 inches of rain a year
Snow: averages 1.6 inches of snow a year

McHenry, Illinois
Summer High: the July high is around 81.9 degrees
Winter Low: the January low is 12.9
Rain: averages 36.1 inches of rain a year
Snow: averages 37.4 inches of snow a year

BestPlaces Comfort Index

Alpharetta

The annual BestPlaces Comfort Index for Alpharetta is 7.6 (10=best), which means it is one of the most pleasant places in Georgia.

7.6 / 10

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

McHenry

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

6.8 / 10

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

Average Monthly High / Low (°F)

Month	McHenry, IL	Alpharetta, GA
January	29° / 13°	50° / 30°
February	33° / 17°	55° / 33°
March	44° / 26°	63° / 39°
April	57° / 37°	72° / 47°
May	68° / 47°	78° / 56°
June	78° / 57°	85° / 65°
July	82° / 62°	88° / 68°
August	80° / 61°	87° / 68°
September	73° / 52°	81° / 61°
October	61° / 40°	72° / 49°
November	47° / 30°	62° / 40°
December	33° / 18°	52° / 33°

Hot, Freezing, Rainy, Snowy Days: McHenry / Alpharetta

Month	Hot Days	Freezing Days	Rainy Days	Snowy Days
January	0 / 0	30 / 19	9 / 11	7 / 1
February	0 / 0	26 / 13	8 / 10	5 / 0
March	0 / 0	23 / 7	9 / 10	3 / 0
April	0 / 0	9 / 1	11 / 9	1 / 0
May	0 / 0	1 / 0	12 / 9	0 / 0
June	2 / 6	0 / 0	11 / 10	0 / 0
July	3 / 10	0 / 0	9 / 10	0 / 0
August	2 / 9	0 / 0	9 / 9	0 / 0
September	0 / 2	0 / 0	9 / 7	0 / 0
October	0 / 0	6 / 1	9 / 7	0 / 0
November	0 / 0	17 / 7	9 / 8	1 / 0
December	0 / 0	28 / 17	9 / 10	6 / 0

July is the hottest month for McHenry with an average high temperature of 81.9°, which ranks it as one of the coolest places in Illinois. In McHenry, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for McHenry are June, August and July.

July is the hottest month for Alpharetta with an average high temperature of 87.9°, which ranks it as cooler than most places in Georgia. In Alpharetta, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Alpharetta are May, September and October.

January has the coldest nighttime temperatures for McHenry with an average of 12.9°. This is colder than most places in Illinois.

January has the coldest nighttime temperatures for Alpharetta with an average of 30.0°. This is colder than most places in Georgia.

In McHenry, there are 7.6 days annually when the high temperature is over 90°, which is one of the coolest places in Illinois.

In Alpharetta, there are 27.3 days annually when the high temperature is over 90°, which is cooler than most places in Georgia.

In McHenry, there are 138.0 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.

In Alpharetta, there are 64.5 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Georgia.

In McHenry, there are 11.5 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

In Alpharetta, there are 0.1 days annually when the nighttime low temperature falls below zero°, which is one of the coldest places in Georgia.

June is the wettest month in McHenry with 4.3 inches of rain, and the driest month is January with 1.5 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 36.1 inches in McHenry means that it is one of the driest places in Illinois.

March is the wettest month in Alpharetta with 5.1 inches of rain, and the driest month is April with 3.8 inches. The wettest season is Spring with 27% of yearly precipitation and 23% occurs in Winter, which is the driest season. The annual rainfall of 53.4 inches in Alpharetta means that it is wetter than most places in Georgia.

May is the rainiest month in McHenry with 11.8 days of rain, and February is the driest month with only 7.6 rainy days. There are 112.8 rainy days annually in McHenry, 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.

January is the rainiest month in Alpharetta with 10.5 days of rain, and October is the driest month with only 6.8 rainy days. There are 108.0 rainy days annually in Alpharetta, which is rainier than most places in Georgia. The rainiest season is Spring when it rains 28% of the time and the driest is Winter with only a 21% chance of a rainy day.

An annual snowfall of 37.4 inches in McHenry means that it is one of the snowiest places in Illinois.

An annual snowfall of 1.6 inches in Alpharetta means that it is snowier than most places in Georgia.

January is the snowiest month in McHenry with 11.4 inches of snow, and 6 months of the year have significant snowfall.

January is the snowiest month in Alpharetta with 0.7 inches of snow, and 1 month 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 Mchenry 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

| Reply

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Reviews for Alpharetta 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:
McHenry, IL vs Alpharetta, GA

Highlights

Weather Highlights

BestPlaces Comfort Index

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: McHenry / Alpharetta

January has the coldest nighttime temperatures for McHenry with an average of 12.9°. This is colder than most places in Illinois.

January has the coldest nighttime temperatures for Alpharetta with an average of 30.0°. This is colder than most places in Georgia.

In McHenry, there are 7.6 days annually when the high temperature is over 90°, which is one of the coolest places in Illinois.

In Alpharetta, there are 27.3 days annually when the high temperature is over 90°, which is cooler than most places in Georgia.

In McHenry, there are 138.0 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.

In Alpharetta, there are 64.5 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Georgia.

In McHenry, there are 11.5 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

In Alpharetta, there are 0.1 days annually when the nighttime low temperature falls below zero°, which is one of the coldest places in Georgia.

An annual snowfall of 37.4 inches in McHenry means that it is one of the snowiest places in Illinois.

An annual snowfall of 1.6 inches in Alpharetta means that it is snowier than most places in Georgia.

January is the snowiest month in McHenry with 11.4 inches of snow, and 6 months of the year have significant snowfall.

January is the snowiest month in Alpharetta with 0.7 inches of snow, and 1 month of the year have significant snowfall.

DID YOU KNOW?

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Reviews for Alpharetta 2 Reviews

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2025 Compare Climate & Weather:McHenry, IL vs Alpharetta, GA

Highlights

Weather Highlights

BestPlaces Comfort Index

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: McHenry / Alpharetta

January has the coldest nighttime temperatures for McHenry with an average of 12.9°. This is colder than most places in Illinois.January has the coldest nighttime temperatures for Alpharetta with an average of 30.0°. This is colder than most places in Georgia.

In McHenry, there are 7.6 days annually when the high temperature is over 90°, which is one of the coolest places in Illinois.In Alpharetta, there are 27.3 days annually when the high temperature is over 90°, which is cooler than most places in Georgia.

In McHenry, there are 138.0 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.In Alpharetta, there are 64.5 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Georgia.

In McHenry, there are 11.5 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.In Alpharetta, there are 0.1 days annually when the nighttime low temperature falls below zero°, which is one of the coldest places in Georgia.

An annual snowfall of 37.4 inches in McHenry means that it is one of the snowiest places in Illinois.An annual snowfall of 1.6 inches in Alpharetta means that it is snowier than most places in Georgia.

January is the snowiest month in McHenry with 11.4 inches of snow, and 6 months of the year have significant snowfall.January is the snowiest month in Alpharetta with 0.7 inches of snow, and 1 month of the year have significant snowfall.

DID YOU KNOW?

Reviews for Mchenry 2 Reviews

Reviews for Alpharetta 2 Reviews

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Zips In McHenry, Illinois

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2025 Compare Climate & Weather:
McHenry, IL vs Alpharetta, GA

January has the coldest nighttime temperatures for McHenry with an average of 12.9°. This is colder than most places in Illinois.

January has the coldest nighttime temperatures for Alpharetta with an average of 30.0°. This is colder than most places in Georgia.

In McHenry, there are 7.6 days annually when the high temperature is over 90°, which is one of the coolest places in Illinois.

In Alpharetta, there are 27.3 days annually when the high temperature is over 90°, which is cooler than most places in Georgia.

In McHenry, there are 138.0 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.

In Alpharetta, there are 64.5 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Georgia.

In McHenry, there are 11.5 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

In Alpharetta, there are 0.1 days annually when the nighttime low temperature falls below zero°, which is one of the coldest places in Georgia.

An annual snowfall of 37.4 inches in McHenry means that it is one of the snowiest places in Illinois.

An annual snowfall of 1.6 inches in Alpharetta means that it is snowier than most places in Georgia.

January is the snowiest month in McHenry with 11.4 inches of snow, and 6 months of the year have significant snowfall.

January is the snowiest month in Alpharetta with 0.7 inches of snow, and 1 month of the year have significant snowfall.