Hampden is a town located in Penobscot County, Maine. The climate in Hampden is characterized by cold winters and mild summers, with an average temperature of 43°F. The town is home to several lakes and ponds, including Green Lake, which is the largest in the region. The hydrology of Hampden is heavily influenced by the Penobscot River, which flows through the town and provides opportunities for fishing, kayaking, and boating. Other outdoor recreation opportunities in Hampden include hiking along the trails at the nearby Hirundo Wildlife Refuge, skiing at the Hermon Mountain Ski Area, and golfing at the Hampden Country Club.