Radnor, Ohio is a small village located in Delaware County, within the central part of the state. The climate in Radnor is characterized as humid continental, with warm summers and cold winters. Average temperatures range from the mid-30s°F in winter to the high 70s°F in summer. Precipitation is evenly distributed throughout the year, with an average annual rainfall of around 38 inches.

Hydrologically, Radnor is situated near the Olentangy River, which runs through the county. The area is also dotted with several small creeks and streams, contributing to the region's hydrology. These water bodies provide opportunities for fishing, kayaking, and canoeing.

Outdoor enthusiasts can explore the natural beauty of Radnor through several recreational activities. Alum Creek State Park is located nearby and offers opportunities for camping, hiking, boating, and swimming. The park also has designated hunting areas. In addition, the area has numerous parks and nature reserves that provide trails for walking, jogging, and biking.

Overall, Radnor, Ohio, with its pleasant climate, water resources, and outdoor recreational opportunities, offers a charming environment for nature lovers and outdoor enthusiasts.