Hadley is located in Mercer County, Pennsylvania. There are roughly 1,882 residents, living in 757 households. The average temperature for Hadley this time of the year is low of 57F and high of 82F. On average, Hadley gets about 4.35 inches of precipitation in July. Most residents are home owners (86%), have a high school diploma (72%) and are married, no kids (37%).
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