Derry is located in Westmoreland County, Pennsylvania. There are roughly 2,640 residents, living in 1,112 households. The average temperature for Derry this time of the year is low of 59F and high of 82F. On average, Derry gets about 5.03 inches of precipitation in July. Most residents are home owners (67%), have a high school diploma (54%) and are single, no kids (44%).
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