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Mount Oliver is located in Allegheny County, Pennsylvania. There are roughly 3,408 residents, living in 1,464 households. The average temperature for Mount Oliver this time of the year is low of 57F and high of 80F. On average, Mount Oliver gets about 3.87 inches of precipitation in June. 45% residents are home owners, have a high school diploma (57%) and are single, no kids (55%).