Harrison, Ohio has a humid subtropical climate with hot summers and cold winters. The area is prone to flooding due to its location near the Great Miami River and Whitewater River. Hydrology constituents in the area include agriculture runoff, wastewater treatment plants, and industrial discharges. Despite these challenges, there are several outdoor recreation opportunities in Harrison, such as hiking and fishing at the Whitewater Memorial State Park, golfing at Miami Whitewater Forest Golf Course, and camping and boating at the nearby Brookville Lake. Overall, Harrison offers a mix of natural beauty and recreational activities for visitors and residents alike.