2025 Compare Climate & Weather:
Ontario, CA vs Ann Arbor, MI

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Highlights

On average, there are 178 sunny days per year in Ann Arbor. Ontario averages 279 sunny days per year. The US average is 205 sunny days.

Ann Arbor, Michigan gets 36 inches of rain, on average, per year. Ontario, California gets 15.7 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Ann Arbor averages 43 inches of snow per year. Ontario averages 0 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Ann Arbor, Michigan
Summer High: the July high is around 82.8 degrees
Winter Low: the January low is 16.5
Rain: averages 36 inches of rain a year
Snow: averages 43 inches of snow a year

Ontario, California
Summer High: the July high is around 91.9 degrees
Winter Low: the January low is 42.6
Rain: averages 15.7 inches of rain a year
Snow: averages 0 inches of snow a year

BestPlaces Comfort Index

Ann Arbor

The annual BestPlaces Comfort Index for Ann Arbor is 6.7 (10=best), which means it is more comfortable than most places in Michigan.

6.7 / 10

August, July and June are the most pleasant months in Ann Arbor, while January and December are the least comfortable months.

Ontario

The annual BestPlaces Comfort Index for Ontario is 8.8 (10=best), which means it is more comfortable than most places in California.

8.8 / 10

May, June and October are the most pleasant months in Ontario, while August and July are the least comfortable months.

Average Monthly High / Low (°F)

Month	Ontario, CA	Ann Arbor, MI
January	67° / 43°	31° / 17°
February	67° / 44°	35° / 18°
March	70° / 46°	45° / 26°
April	75° / 49°	59° / 36°
May	79° / 54°	70° / 47°
June	85° / 58°	79° / 56°
July	92° / 62°	83° / 61°
August	93° / 63°	81° / 59°
September	90° / 60°	74° / 51°
October	81° / 54°	61° / 40°
November	73° / 46°	48° / 31°
December	67° / 41°	35° / 22°

Hot, Freezing, Rainy, Snowy Days: Ontario / Ann Arbor

Month	Hot Days	Freezing Days	Rainy Days	Snowy Days
January	0 / 0	1 / 29	5 / 14	0 / 10
February	0 / 0	0 / 26	6 / 11	0 / 8
March	0 / 0	0 / 25	5 / 11	0 / 5
April	2 / 0	0 / 9	3 / 12	0 / 1
May	4 / 0	0 / 1	1 / 12	0 / 0
June	8 / 1	0 / 0	1 / 11	0 / 0
July	20 / 3	0 / 0	0 / 10	0 / 0
August	22 / 1	0 / 0	0 / 10	0 / 0
September	16 / 0	0 / 0	1 / 10	0 / 0
October	6 / 0	0 / 6	2 / 11	0 / 0
November	1 / 0	0 / 16	3 / 12	0 / 2
December	0 / 0	2 / 28	4 / 14	0 / 8

August is the hottest month for Ontario with an average high temperature of 93.4°, which ranks it as warmer than most places in California. In Ontario, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Ontario are May, October and April.

July is the hottest month for Ann Arbor with an average high temperature of 82.8°, which ranks it as warmer than most places in Michigan. In Ann Arbor, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Ann Arbor are June, August and September.

December has the coldest nighttime temperatures for Ontario with an average of 41.4°. This is warmer than most places in California.

January has the coldest nighttime temperatures for Ann Arbor with an average of 16.5°. This is warmer than most places in Michigan.

In Ontario, there are 79.5 days annually when the high temperature is over 90°, which is hotter than most places in California.

In Ann Arbor, there are 5.8 days annually when the high temperature is over 90°, which is about average compared to other places in Michigan.

In Ontario, there are 3.6 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.

In Ann Arbor, there are 140.9 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Michigan.

In Ontario, 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 Ann Arbor, there are 3.9 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Michigan.

February is the wettest month in Ontario with 3.8 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 60% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 15.7 inches in Ontario means that it is drier than most places in California.

June is the wettest month in Ann Arbor with 3.7 inches of rain, and the driest month is February with 2.2 inches. The wettest season is Autumn with 30% of yearly precipitation and 20% occurs in Spring, which is the driest season. The annual rainfall of 36.0 inches in Ann Arbor means that it is wetter than most places in Michigan.

February is the rainiest month in Ontario with 5.7 days of rain, and July is the driest month with only 0.2 rainy days. There are 30.5 rainy days annually in Ontario, which is one of the least rainy places in California. The rainiest season is Spring when it rains 50% of the time and the driest is Autumn with only a 4% chance of a rainy day.

December is the rainiest month in Ann Arbor with 13.9 days of rain, and September is the driest month with only 9.6 rainy days. There are 136.9 rainy days annually in Ann Arbor, which is rainier than most places in Michigan. The rainiest season is Spring when it rains 28% of the time and the driest is Autumn with only a 23% chance of a rainy day.

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

An annual snowfall of 43.0 inches in Ann Arbor means that it is less snowy than most places in Michigan.

Any measurable snowfall is a rare occurance in Ontario.

January is the snowiest month in Ann Arbor with 12.4 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 Ontario 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 Ontario

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Reviews for Ann Arbor 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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See all reviews

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2025 Compare Climate & Weather:
Ontario, CA vs Ann Arbor, MI

Highlights

Weather Highlights

BestPlaces Comfort Index

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Ontario / Ann Arbor

December has the coldest nighttime temperatures for Ontario with an average of 41.4°. This is warmer than most places in California.

January has the coldest nighttime temperatures for Ann Arbor with an average of 16.5°. This is warmer than most places in Michigan.

In Ontario, there are 79.5 days annually when the high temperature is over 90°, which is hotter than most places in California.

In Ann Arbor, there are 5.8 days annually when the high temperature is over 90°, which is about average compared to other places in Michigan.

In Ontario, there are 3.6 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.

In Ann Arbor, there are 140.9 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Michigan.

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

An annual snowfall of 43.0 inches in Ann Arbor means that it is less snowy than most places in Michigan.

Any measurable snowfall is a rare occurance in Ontario.

January is the snowiest month in Ann Arbor with 12.4 inches of snow, and 6 months of the year have significant snowfall.

DID YOU KNOW?

Reviews for Ontario 2 Reviews

Reviews for Ann Arbor 2 Reviews

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2025 Compare Climate & Weather:Ontario, CA vs Ann Arbor, MI

Highlights

Weather Highlights

BestPlaces Comfort Index

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Ontario / Ann Arbor

December has the coldest nighttime temperatures for Ontario with an average of 41.4°. This is warmer than most places in California.January has the coldest nighttime temperatures for Ann Arbor with an average of 16.5°. This is warmer than most places in Michigan.

In Ontario, there are 79.5 days annually when the high temperature is over 90°, which is hotter than most places in California.In Ann Arbor, there are 5.8 days annually when the high temperature is over 90°, which is about average compared to other places in Michigan.

In Ontario, there are 3.6 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.In Ann Arbor, there are 140.9 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Michigan.

In Ontario, 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 Ann Arbor, there are 3.9 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Michigan.

There is rarely any recorded snowfall in Ontario, ranking it as one of the least snowy places in California.An annual snowfall of 43.0 inches in Ann Arbor means that it is less snowy than most places in Michigan.

Any measurable snowfall is a rare occurance in Ontario.January is the snowiest month in Ann Arbor with 12.4 inches of snow, and 6 months of the year have significant snowfall.

DID YOU KNOW?

Reviews for Ontario 2 Reviews

Reviews for Ann Arbor 2 Reviews

Most Recent Searches On Compare Climate & Weather

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Zips In Ontario, California

Zips In ANN ARBOR, MICHIGAN

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2025 Compare Climate & Weather:
Ontario, CA vs Ann Arbor, MI

December has the coldest nighttime temperatures for Ontario with an average of 41.4°. This is warmer than most places in California.

January has the coldest nighttime temperatures for Ann Arbor with an average of 16.5°. This is warmer than most places in Michigan.

In Ontario, there are 79.5 days annually when the high temperature is over 90°, which is hotter than most places in California.

In Ann Arbor, there are 5.8 days annually when the high temperature is over 90°, which is about average compared to other places in Michigan.

In Ontario, there are 3.6 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.

In Ann Arbor, there are 140.9 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Michigan.

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

An annual snowfall of 43.0 inches in Ann Arbor means that it is less snowy than most places in Michigan.

Any measurable snowfall is a rare occurance in Ontario.

January is the snowiest month in Ann Arbor with 12.4 inches of snow, and 6 months of the year have significant snowfall.