Chester County, PA Climate

Chester, PA County enjoys a temperate climate with four distinct seasons. In the summer months, temperatures range from the mid-60s to the mid-80s Fahrenheit. Winters are mild with an average temperature of around 40 degrees Fahrenheit and occasional snowfall. Spring and fall bring comfortable temperatures ranging from the 50s to 70s. The area has an average yearly rainfall of 45 inches, providing plenty of moisture for vegetation throughout the year.

Chester County, Pennsylvania gets 47 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Chester County averages 24 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 202 sunny days per year in Chester County. The US average is 205 sunny days.

Chester County gets some kind of precipitation, on average, 121 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 85 degrees
Winter Low: the January low is 21
Rain: averages 47 inches of rain a year
Snow: averages 24 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Chester County is 7.2 (10=best), which means it is one of the most pleasant places in Pennsylvania.

8.7 Summer - 5.3 Winter

June, September and May are the most pleasant months in Chester County, while January and February are the least comfortable months.

Climate	Chester, Pennsylvania	United States
	47.4 in.	38.1 in.
	24.0 in.	27.8 in.
	121.1 days	106.2 days
	202 days	205 days
	85.2°	85.8°
	21.2°	21.7°
	7.2	7
	4	4.3
	439 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.

July is the hottest month for Chester County with an average high temperature of 85.2°, which ranks it as warmer than most places in Pennsylvania. In Chester County, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Chester County are September, June and August.

In Chester County, there are 14.7 days annually when the high temperature is over 90°, which is hotter than most places in Pennsylvania.

January has the coldest nighttime temperatures for Chester County with an average of 21.2°. This is warmer than most places in Pennsylvania.

In Chester County, there are 114.7 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Pennsylvania.

In Chester County, there are 0.9 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Pennsylvania.

The humidity is usually comfortable in Chester County but some summer months can be sticky or muggy. July is the most humid month, though humidity is low for most of the year. The most humid months are July, August and June.

September is the wettest month in Chester County with 4.7 inches of rain, and the driest month is February with 3.0 inches. The wettest season is Autumn with 26% of yearly precipitation and 22% occurs in Spring, which is the driest season. The annual rainfall of 47.4 inches in Chester County means that it is wetter than most places in Pennsylvania.

May is the rainiest month in Chester County with 11.6 days of rain, and September is the driest month with only 8.8 rainy days. There are 121.1 rainy days annually in Chester County, which is less rainy than most places in Pennsylvania. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 23% chance of a rainy day.

An annual snowfall of 24.0 inches in Chester County means that it is less snowy than most places in Pennsylvania. February is the snowiest month in Chester County with 8.9 inches of snow, and 6 months of the year have significant snowfall.

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