Newell, Iowa experiences a humid continental climate, characterized by hot, humid summers and cold, snowy winters. The area receives an average annual precipitation of around 34 inches, with rainfall being evenly distributed throughout the year. Located near the Little Sioux River, Newell benefits from a relatively abundant water supply.

Hydrologically, the Little Sioux River is a significant feature in the region, flowing through Newell and offering opportunities for fishing, canoeing, and kayaking. Outdoor enthusiasts can also explore nearby Black Hawk Lake, known for its clear waters and sandy beaches, perfect for swimming and boating. Additionally, the area's diverse landscape allows for activities like hiking, camping, and wildlife observation in the surrounding forests and prairies. Newell provides ample opportunities for nature lovers and outdoor enthusiasts to engage in various recreational activities throughout the year.