Underwood, Iowa is a small town located in Pottawattamie County, in the United States. The climate in Underwood is considered humid continental, characterized by hot, humid summers and cold winters. Average summer temperatures range from 70°F to 90°F, while winter temperatures can drop to below freezing, averaging 10°F to 30°F. Precipitation is fairly evenly distributed throughout the year, with the majority of rainfall occurring during spring and summer.

The town of Underwood is situated near the Missouri River, which influences the local hydrology constituents. The river provides a source of water for irrigation and recreational activities, such as boating and fishing. Additionally, the area is dotted with numerous small lakes and ponds that offer opportunities for water-based recreation.

Outdoor enthusiasts in Underwood can explore the nearby Hitchcock Nature Center, which spans over 1,200 acres and offers hiking trails, camping sites, and bird-watching opportunities. The Wabash Trace Nature Trail, a converted railroad route, provides a scenic path for biking, walking, and wildlife observation.

In summary, Underwood, Iowa experiences a humid continental climate, influenced by the nearby Missouri River. The hydrology constituents include the river and various lakes, offering recreational activities such as boating and fishing. The town also provides outdoor recreation opportunities through its nature center and nature trails.