Mark Center is a small village located in Williams County, Ohio. It experiences a humid continental climate, characterized by warm summers and cold winters. Average temperatures range from around 30°F (-1°C) in winter to approximately 75°F (24°C) in summer. Precipitation is evenly distributed throughout the year, with an average of 35 inches (89 cm) annually.

In terms of hydrology constituents, Mark Center is situated near the St. Joseph River, which offers recreational opportunities like fishing, kayaking, and canoeing. The river supports diverse aquatic life, including smallmouth bass, catfish, and various panfish species. Additionally, a few small ponds and lakes can be found in the surrounding area, providing additional opportunities for fishing and boating.

Outdoor recreation enthusiasts can explore the nearby Harrison Lake State Park, located just east of Mark Center. The park offers activities such as hiking, camping, picnicking, and swimming. Its picturesque setting includes woodlands, meadows, and a 142-acre lake that allows boating and fishing. Wildlife observation is also popular, with the chance to spot various bird species, deer, and other wildlife.

In summary, Mark Center, Ohio experiences a typical humid continental climate, offering a range of outdoor recreation opportunities including river-based activities and access to Harrison Lake State Park.