Millerton, Iowa is a small town located in Appanoose County, in the southeastern part of the state. The town experiences a humid continental climate, characterized by hot, humid summers and cold winters. Average temperatures range from around 25°F (-4°C) in winter to 85°F (29°C) in summer, with precipitation spread fairly evenly throughout the year.

The hydrology of Millerton is influenced by its proximity to Rathbun Lake, a popular outdoor recreation spot. The lake, covering approximately 11,000 acres, offers various water activities such as boating, fishing, and swimming. The lake is known for its diverse fish population, including largemouth bass, crappie, and catfish, attracting anglers from afar. Additionally, the surrounding area provides opportunities for hiking, camping, and bird-watching, with several trails that offer picturesque views of the lake and its surrounding woodlands.

Overall, Millerton, Iowa provides a pleasant climate for outdoor enthusiasts, with its proximity to Rathbun Lake offering a range of water-based activities while also providing opportunities to explore and enjoy the natural beauty of the area.