Smithfield, Ohio is a small town located in Jefferson County. It experiences a humid continental climate, characterized by warm summers and cold winters. Average temperatures range from 25°F (-4°C) in winter to 85°F (29°C) in summer. The region receives approximately 40 inches of rainfall annually, with the majority occurring during the warmer months.

The hydrology of Smithfield is primarily influenced by the Ohio River, located just 8 miles to the west. The river provides opportunities for water-related activities such as boating, fishing, and swimming. Additionally, Smithfield is surrounded by several small lakes and creeks, which offer tranquil settings for fishing and canoeing.

Outdoor enthusiasts in Smithfield can explore the numerous parks and recreational areas, such as the Smithfield Community Park, which features walking trails, picnic areas, and playgrounds. The nearby Jefferson Lake State Park is also a popular destination for camping, hiking, and wildlife observation. Additionally, the region's scenic countryside and rolling hills provide opportunities for biking and horseback riding.

Overall, Smithfield, Ohio offers a pleasant climate, abundant water resources, and various outdoor recreation opportunities for residents and visitors alike.