Letts, Iowa is a small town located in Louisa County, in the southeastern part of the state. The climate in Letts is classified as humid continental, characterized by hot summers and cold winters. Average temperatures range from around 25°F (-4°C) in January to 86°F (30°C) in July. Precipitation is relatively evenly distributed throughout the year, with an average annual rainfall of about 36 inches (91 cm).

Letts is situated near the Iowa River, which provides a significant hydrological presence in the area. The river and its tributaries not only contribute to the local water supply but also offer opportunities for various outdoor activities. Fishing enthusiasts can enjoy angling for species such as catfish, bass, and walleye, while boating and canoeing are popular ways to explore the picturesque waterways.

Additionally, Letts is surrounded by natural areas, including parks and trails, which provide ample opportunities for outdoor recreation. Louisa County Natural Area, for instance, offers scenic hiking trails, camping facilities, and wildlife viewing opportunities. Overall, Letts, Iowa presents a charming rural setting with a diverse range of outdoor activities for nature lovers and outdoor enthusiasts to enjoy.