Derby is a small city located in Lucas County, Iowa, with a population of approximately 120 residents. The climate in Derby is classified as a humid continental climate with warm summers and cold winters. The hydrology constituents of Derby are primarily composed of the Chariton River, which flows through the city and provides a variety of outdoor recreation opportunities, such as fishing, boating, and swimming. The Chariton River is also popular for birdwatching and hiking along the nature trails that run alongside the river. Additionally, there are several parks located within Derby, including the Derby City Park, which offers playground equipment, picnic areas, and a baseball field for visitors to enjoy.