Derry, PA Climate


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United States / Pennsylvania / Pittsburgh Metro Area / Westmoreland County / Derry / Zip Codes
Derry Borough, Pennsylvania has a humid continental climate with cold winters and warm summers. Average temperatures range from around 27-78 degrees Fahrenheit throughout the year. Precipitation is relatively consistent throughout the year, with highest amounts in May and lowest in July. Snowfall is common during the winter months, averaging about 20 inches per year. The area enjoys four distinct seasons and generally experiences moderate weather conditions.

Derry, Pennsylvania gets 46 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Derry averages 36 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 164 sunny days per year in Derry. The US average is 205 sunny days.

Derry gets some kind of precipitation, on average, 145 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 84 degrees
Winter Low: the January low is 19
Rain: averages 46 inches of rain a year
Snow: averages 36 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Derry borough is 6.9 (10=best), which means it is about average compared to other places in Pennsylvania.

9.1 Summer - 4.8 Winter
August, July and June are the most pleasant months in Derry borough, while January and February are the least comfortable months.

  ClimateDerry, PennsylvaniaUnited States
    Unlock38.1 in.
  35.5 in.  Unlock
    Unlock106.2 days
  164 days  Unlock
  83.7°85.8°
    Unlock21.7°
  6.9  Unlock
    Unlock4.3
  1181 ft.  Unlock
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 Derry borough with an average high temperature of 83.7°, which ranks it as about average compared to other places in Pennsylvania. In Derry borough, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Derry borough are September, June and August.
In Derry borough, there are 9.7 days annually when the high temperature is over 90°, which is about average compared to other places in Pennsylvania.
January has the coldest nighttime temperatures for Derry borough with an average of 18.8°. This is about average compared to other places in Pennsylvania.
In Derry borough, there are 128.0 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Pennsylvania.
In Derry borough, there are 5.0 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Pennsylvania.
Humidity in Derry borough is generally low and comfortable. But there some days when the humidity becomes unpleasant, especially in July and August. The most humid months (but still comfortable) are July, August and June.
July is the wettest month in Derry borough with 4.6 inches of rain, and the driest month is February with 2.9 inches. The wettest season is Autumn with 29% of yearly precipitation and 21% occurs in Spring, which is the driest season. The annual rainfall of 45.8 inches in Derry borough means that it is wetter than most places in Pennsylvania.
January is the rainiest month in Derry borough with 14.6 days of rain, and August is the driest month with only 9.7 rainy days. There are 144.7 rainy days annually in Derry borough, 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.
An annual snowfall of 35.5 inches in Derry borough means that it is snowier than most places in Pennsylvania. January is the snowiest month in Derry borough with 11.4 inches of snow, and 6 months of the year have significant snowfall.
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