The most pleasant months of the year for the 91761 zip code are May, October and April. In the 91761 zip code, there are 5 comfortable months with high temperatures in the range of 70-85°. August is the hottest month for the 91761 zip code with an average high temperature of 94.0°, which ranks it as warmer than most places in California. Any measurable snowfall is a rare occurance in the 91761 zip code. There are few days during the summer when the humidity becomes unpleasant.
Summer High: the July high is around 92 degrees
Winter Low: the January low is 42
Rain: averages 14 inches of rain a year
Snow: averages 0 inches of snow a year
BESTPLACES COMFORT INDEX
The annual BestPlaces Comfort Index for the Ontario (zip 91761) area is 8.8 (10=best), which means it is more comfortable than most places in California.
8.8 / 10
A higher score indicates a more comfortable year-round climate. The US average for the comfort index is 7. Our index is based on the total number of days annually within the comfort range of 70-80 degrees, and we also applied a penalty for days of excessive humidity.
Average Monthly High and Low (°F)
Hot, Freezing, Rainy, Snowy Days: Ontario
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.