Lewistown, Missouri is a small town located in Lewis County, in the northeastern part of the state. The town experiences a humid continental climate, characterized by hot and humid summers and cold winters. Average temperatures range from the mid-80s (Fahrenheit) in the summer to the mid-20s in the winter, with occasional extreme weather events like thunderstorms and tornadoes.

Hydrologically, Lewistown is situated near the Mississippi River, which flows along the eastern border of the county. This proximity provides opportunities for various water-based activities such as boating, fishing, and canoeing. The river also attracts a diverse range of wildlife, making it a popular spot for birdwatching and nature enthusiasts.

In addition to the river, Lewistown is surrounded by picturesque landscapes and natural areas, including Mark Twain State Park and Wakonda State Park. These parks offer visitors opportunities for hiking, camping, and picnicking. The scenic countryside also provides great conditions for outdoor activities like hunting and wildlife viewing.

Overall, Lewistown, Missouri offers a pleasant climate, access to the Mississippi River, and a variety of outdoor recreational opportunities, making it an attractive destination for nature lovers and those seeking adventure in a small-town setting.