Upper Darby, PA Climate

The climate in Upper Darby, PA is generally mild throughout the year. The summers are usually hot and humid, with temperatures reaching the high 80s and low 90s on average. Winters tend to be cold with temperatures typically ranging from the low 20s to upper 30s. Overall, Upper Darby enjoys seasonal temperatures that are fairly comfortable year-round. Precipitation is relatively common throughout the year, with most of it occurring during spring and summer months in the form of heavy showers or thunderstorms. Snowfall tends to be light but can vary from year to year.

Upper Darby, Pennsylvania gets 45 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Upper Darby averages 18 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 204 sunny days per year in Upper Darby. The US average is 205 sunny days.

Upper Darby gets some kind of precipitation, on average, 118 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 87 degrees
Winter Low: the January low is 26
Rain: averages 45 inches of rain a year
Snow: averages 18 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Upper Darby is 7.3 (10=best), which means it is one of the most pleasant places in Pennsylvania.

8.1 Summer - 5.7 Winter

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

Climate	Upper Darby, Pennsylvania	United States
	45.2 in.	38.1 in.
	18.0 in.	27.8 in.
	118.4 days	106.2 days
	204 days	205 days
	87.3°	85.8°
	26.2°	21.7°
	7.3	7
	3.8	4.3
	56 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 Upper Darby with an average high temperature of 87.3°, which ranks it as one of the hottest places in Pennsylvania. In Upper Darby, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Upper Darby are September, May and June.

In Upper Darby, there are 26.6 days annually when the high temperature is over 90°, which is one of the hottest places in Pennsylvania.

January has the coldest nighttime temperatures for Upper Darby with an average of 26.2°. This is one of the warmest places in Pennsylvania.

In Upper Darby, there are 75.1 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Pennsylvania.

In Upper Darby, there are 0.3 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Pennsylvania.

The humidity is usually comfortable in Upper Darby 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.

July is the wettest month in Upper Darby with 4.5 inches of rain, and the driest month is February with 2.9 inches. The wettest season is Autumn with 27% of yearly precipitation and 22% occurs in Spring, which is the driest season. The annual rainfall of 45.2 inches in Upper Darby means that it is wetter than most places in Pennsylvania.

April is the rainiest month in Upper Darby with 11.7 days of rain, and September is the driest month with only 8.4 rainy days. There are 118.4 rainy days annually in Upper Darby, which is less rainy than most places in Pennsylvania. The rainiest season is Summer when it rains 29% of the time and the driest is Winter with only a 22% chance of a rainy day.

An annual snowfall of 18.0 inches in Upper Darby means that it is one of the least snowy places in Pennsylvania. February is the snowiest month in Upper Darby with 6.7 inches of snow, and 4 months of the year have significant snowfall.