Martinsville, Ohio is a small village located in the southern part of the state. The area experiences a humid continental climate, characterized by hot summers and cold winters. Summers in Martinsville are typically warm, with temperatures averaging around 85°F (29°C), while winters can be quite cold, with temperatures dropping to around 30°F (-1°C). The area receives an average annual precipitation of around 40 inches, evenly distributed throughout the year.

Hydrologically, Martinsville is home to several small streams and creeks that eventually flow into the nearby East Fork Little Miami River. These waterways provide opportunities for fishing and kayaking enthusiasts to enjoy outdoor recreation. The East Fork Lake, located just a short distance from Martinsville, offers additional water-based activities such as boating and swimming.

In terms of outdoor recreation, Martinsville is surrounded by picturesque natural landscapes. The nearby Caesar Creek State Park offers hiking trails, camping sites, and opportunities for bird-watching and wildlife spotting. Additionally, the area is known for its scenic drives, allowing visitors to enjoy the beauty of the countryside. Martinsville provides a peaceful and serene environment for those seeking outdoor activities and a chance to connect with nature.