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Gahanna is located in Franklin County, Ohio. There are roughly 31,416 residents, living in 12,379 households. The average temperature for Gahanna this time of the year is low of 62F and high of 85F. On average, Gahanna gets about 4.49 inches of precipitation in July. Most residents are home owners (72%), have a post secondary degree (58%) and are single, no kids (36%).