2025 Compare Climate & Weather:
Monroeville, PA vs Ontario, CA

Highlights

On average, there are 279 sunny days per year in Ontario. Monroeville averages 162 sunny days per year. The US average is 205 sunny days.

Ontario, California gets 15.7 inches of rain, on average, per year. Monroeville, Pennsylvania gets 40.8 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Ontario averages 0 inches of snow per year. Monroeville averages 25 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

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

Monroeville, Pennsylvania
Summer High: the July high is around 83.5 degrees
Winter Low: the January low is 20.6
Rain: averages 40.8 inches of rain a year
Snow: averages 25 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.

The annual BestPlaces Comfort Index for Monroeville is 7.0 (10=best), which means it is more comfortable than most places in Pennsylvania.

Today's Weather - Monroeville, PA

68°F

Today's Weather - Ontario, CA

67°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Monroeville / Ontario

July is the hottest month for Monroeville with an average high temperature of 83.5°, which ranks it as about average compared to other places in Pennsylvania. In Monroeville, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Monroeville are June, September and August.

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.

January has the coldest nighttime temperatures for Monroeville with an average of 20.6°. This is warmer than most places in Pennsylvania.

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

In Monroeville, there are 9.3 days annually when the high temperature is over 90°, which is about average compared to other places in Pennsylvania.

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

In Monroeville, there are 117.8 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Pennsylvania.

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 Monroeville, there are 2.1 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Pennsylvania.

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.

June is the wettest month in Monroeville with 4.4 inches of rain, and the driest month is February with 2.5 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 40.8 inches in Monroeville means that it is drier than most places in Pennsylvania.


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.

January is the rainiest month in Monroeville with 15.3 days of rain, and August is the driest month with only 9.7 rainy days. There are 147.3 rainy days annually in Monroeville, which is rainier than most places in Pennsylvania. The rainiest season is Spring when it rains 28% of the time and the driest is Autumn with only a 22% chance of a rainy day.

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.

An annual snowfall of 25.0 inches in Monroeville means that it is less snowy than most places in Pennsylvania.

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

January is the snowiest month in Monroeville with 8.7 inches of snow, and 6 months of the year have significant snowfall.

Any measurable snowfall is a rare occurance in Ontario.