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Castle Shannon is located in Allegheny County, Pennsylvania. There are roughly 8,314 residents, living in 3,896 households. The average temperature for Castle Shannon this time of the year is low of 57F and high of 80F. On average, Castle Shannon gets about 3.93 inches of precipitation in June. Most residents are home owners (60%), have a post secondary degree (53%) and are single, no kids (54%).