2025 Compare Climate & Weather:
Napa, CA vs Crystal Lake, IL

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Highlights

On average, there are 186 sunny days per year in Crystal Lake. Napa averages 260 sunny days per year. The US average is 205 sunny days.

Crystal Lake, Illinois gets 36.7 inches of rain, on average, per year. Napa, California gets 27.3 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Crystal Lake averages 35.1 inches of snow per year. Napa averages 0 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Crystal Lake, Illinois
Summer High: the July high is around 81.8 degrees
Winter Low: the January low is 12.7
Rain: averages 36.7 inches of rain a year
Snow: averages 35.1 inches of snow a year

Napa, California
Summer High: the July high is around 82.4 degrees
Winter Low: the January low is 37.7
Rain: averages 27.3 inches of rain a year
Snow: averages 0 inches of snow a year

BestPlaces Comfort Index

Crystal Lake

The annual BestPlaces Comfort Index for Crystal Lake 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 Crystal Lake, while January and December are the least comfortable months.

Napa

The annual BestPlaces Comfort Index for Napa is 8.4 (10=best), which means it is more comfortable than most places in California.

8.4 / 10

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

Average Monthly High / Low (°F)

Month	Napa, CA	Crystal Lake, IL
January	57° / 38°	28° / 13°
February	62° / 40°	33° / 17°
March	66° / 42°	44° / 26°
April	70° / 43°	57° / 37°
May	76° / 48°	68° / 47°
June	81° / 51°	78° / 57°
July	82° / 54°	82° / 62°
August	83° / 53°	80° / 61°
September	83° / 51°	73° / 52°
October	77° / 46°	60° / 40°
November	65° / 41°	47° / 30°
December	57° / 37°	32° / 18°

Hot, Freezing, Rainy, Snowy Days: Napa / Crystal Lake

Month	Hot Days	Freezing Days	Rainy Days	Snowy Days
January	0 / 0	7 / 30	11 / 9	0 / 6
February	0 / 0	3 / 26	11 / 8	0 / 5
March	0 / 0	1 / 23	10 / 9	0 / 3
April	0 / 0	0 / 9	7 / 11	0 / 1
May	2 / 0	0 / 1	4 / 12	0 / 0
June	5 / 2	0 / 0	1 / 11	0 / 0
July	5 / 3	0 / 0	0 / 9	0 / 0
August	6 / 2	0 / 0	0 / 10	0 / 0
September	6 / 0	0 / 0	1 / 9	0 / 0
October	1 / 0	0 / 6	4 / 9	0 / 0
November	0 / 0	2 / 18	8 / 10	0 / 1
December	0 / 0	8 / 27	12 / 10	0 / 6

August is the hottest month for Napa with an average high temperature of 83.0°, which ranks it as cooler than most places in California. In Napa, there are 7 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Napa are October, May and June.

July is the hottest month for Crystal Lake with an average high temperature of 81.8°, which ranks it as one of the coolest places in Illinois. In Crystal Lake, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Crystal Lake are June, August and July.

December has the coldest nighttime temperatures for Napa with an average of 37.4°. This is about average compared to other places in California.

January has the coldest nighttime temperatures for Crystal Lake with an average of 12.7°. This is one of the coldest places in Illinois.

In Napa, there are 24.6 days annually when the high temperature is over 90°, which is cooler than most places in California.

In Crystal Lake, there are 6.9 days annually when the high temperature is over 90°, which is one of the coolest places in Illinois.

In Napa, there are 21.3 days annually when the nighttime low temperature falls below freezing, which is colder than most places in California.

In Crystal Lake, there are 138.7 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in Illinois.

In Napa, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in California.

In Crystal Lake, there are 11.6 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

February is the wettest month in Napa with 5.4 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 58% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 27.3 inches in Napa means that it is wetter than most places in California.

August is the wettest month in Crystal Lake with 4.4 inches of rain, and the driest month is January with 1.7 inches. The wettest season is Autumn with 34% of yearly precipitation and 15% occurs in Spring, which is the driest season. The annual rainfall of 36.7 inches in Crystal Lake means that it is drier than most places in Illinois.

December is the rainiest month in Napa with 12.0 days of rain, and July is the driest month with only 0.1 rainy days. There are 68.6 rainy days annually in Napa, which is rainier than most places in California. The rainiest season is Spring when it rains 50% of the time and the driest is Autumn with only a 2% chance of a rainy day.

May is the rainiest month in Crystal Lake with 11.6 days of rain, and February is the driest month with only 7.6 rainy days. There are 114.2 rainy days annually in Crystal Lake, which is rainier than most places in Illinois. The rainiest season is Summer when it rains 27% of the time and the driest is Spring with only a 23% chance of a rainy day.

There is rarely any recorded snowfall in Napa, ranking it as one of the least snowy places in California.

An annual snowfall of 35.1 inches in Crystal Lake means that it is one of the snowiest places in Illinois.

Any measurable snowfall is a rare occurance in Napa.

January is the snowiest month in Crystal Lake with 10.9 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 Napa 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 Crystal Lake 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:
Napa, CA vs Crystal Lake, IL

Highlights

Weather Highlights

BestPlaces Comfort Index

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Napa / Crystal Lake

December has the coldest nighttime temperatures for Napa with an average of 37.4°. This is about average compared to other places in California.

January has the coldest nighttime temperatures for Crystal Lake with an average of 12.7°. This is one of the coldest places in Illinois.

In Napa, there are 24.6 days annually when the high temperature is over 90°, which is cooler than most places in California.

In Crystal Lake, there are 6.9 days annually when the high temperature is over 90°, which is one of the coolest places in Illinois.

In Napa, there are 21.3 days annually when the nighttime low temperature falls below freezing, which is colder than most places in California.

In Crystal Lake, there are 138.7 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in Illinois.

There is rarely any recorded snowfall in Napa, ranking it as one of the least snowy places in California.

An annual snowfall of 35.1 inches in Crystal Lake means that it is one of the snowiest places in Illinois.

Any measurable snowfall is a rare occurance in Napa.

January is the snowiest month in Crystal Lake with 10.9 inches of snow, and 6 months of the year have significant snowfall.

DID YOU KNOW?

Reviews for Napa 2 Reviews

Reviews for Crystal Lake 2 Reviews

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2025 Compare Climate & Weather:Napa, CA vs Crystal Lake, IL

Highlights

Weather Highlights

BestPlaces Comfort Index

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Napa / Crystal Lake

December has the coldest nighttime temperatures for Napa with an average of 37.4°. This is about average compared to other places in California.January has the coldest nighttime temperatures for Crystal Lake with an average of 12.7°. This is one of the coldest places in Illinois.

In Napa, there are 24.6 days annually when the high temperature is over 90°, which is cooler than most places in California.In Crystal Lake, there are 6.9 days annually when the high temperature is over 90°, which is one of the coolest places in Illinois.

In Napa, there are 21.3 days annually when the nighttime low temperature falls below freezing, which is colder than most places in California.In Crystal Lake, there are 138.7 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in Illinois.

There is rarely any recorded snowfall in Napa, ranking it as one of the least snowy places in California.An annual snowfall of 35.1 inches in Crystal Lake means that it is one of the snowiest places in Illinois.

Any measurable snowfall is a rare occurance in Napa.January is the snowiest month in Crystal Lake with 10.9 inches of snow, and 6 months of the year have significant snowfall.

DID YOU KNOW?

Reviews for Napa 2 Reviews

Reviews for Crystal Lake 2 Reviews

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Compare Cost of Living

Zips In Napa, California

Zips In CRYSTAL LAKE, ILLINOIS

Learn More About NAPA, CALIFORNIA

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About BestPlaces

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2025 Compare Climate & Weather:
Napa, CA vs Crystal Lake, IL

December has the coldest nighttime temperatures for Napa with an average of 37.4°. This is about average compared to other places in California.

January has the coldest nighttime temperatures for Crystal Lake with an average of 12.7°. This is one of the coldest places in Illinois.

In Napa, there are 24.6 days annually when the high temperature is over 90°, which is cooler than most places in California.

In Crystal Lake, there are 6.9 days annually when the high temperature is over 90°, which is one of the coolest places in Illinois.

In Napa, there are 21.3 days annually when the nighttime low temperature falls below freezing, which is colder than most places in California.

In Crystal Lake, there are 138.7 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in Illinois.

There is rarely any recorded snowfall in Napa, ranking it as one of the least snowy places in California.

An annual snowfall of 35.1 inches in Crystal Lake means that it is one of the snowiest places in Illinois.

Any measurable snowfall is a rare occurance in Napa.

January is the snowiest month in Crystal Lake with 10.9 inches of snow, and 6 months of the year have significant snowfall.