Ontario, CA Climate

Ontario, California has a Mediterranean climate, with hot summers and mild winters. The summers in Ontario are characterized by temperatures that can reach up to the mid 90s Fahrenheit. During the winter months, the temperatures drop significantly, and often get down into the 40s. Rainfall is seasonally distributed throughout the year, with the driest months occurring during the summer season. Snow is uncommon in Ontario due to its relatively low elevation; however, light snowfall may occur on occasion. Overall, the weather in Ontario typically remains comfortable and enjoyable year-round.

Ontario, California gets 16 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Ontario averages 0 inches of snow per year. The US average is 28 inches of snow per year.

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

Ontario gets some kind of precipitation, on average, 31 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

Weather Highlights

Summer High: the July high is around 92 degrees
Winter Low: the January low is 43
Rain: averages 16 inches of rain a year
Snow: averages 0 inches of snow a year

Bestplaces Comfort Index

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

8.5 Summer - 8.6 Winter

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

Climate	Ontario, California	United States
	15.7 in.	38.1 in.
	0.0 in.	27.8 in.
	30.5 days	106.2 days
	279 days	205 days
	91.9°	85.8°
	42.6°	21.7°
	8.8	7
	5.7	4.3
	1004 ft.	2443 ft.

Climate

YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

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.

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

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

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 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.

Humidity in Ontario is generally quite low and comfortable. There are few days during the summer when the humidity becomes unpleasant. The most humid months (but still comfortable) are July, August and June.

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.

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.

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

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Robert · Rancho Cucamonga, CA

Best Reformed Church available

Over 12 years ago

We've lived in this area for several years. Traveling long distances to other cities for churches. Passing a quiet, unassuming church along the way for years. Until More

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sachamo · Pomona, CA

Home is where the heart is

Over 13 years ago

cool More

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yvonne · Ontario, CA

Entertainment and shopping

Over 13 years ago

I think Ontario,ca us awesome because we have an entertainment Venue and large shopping mall to please everyone of all More

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