Duncanville, Texas is a suburban city located in Dallas County with a humid subtropical climate. Summers are hot and humid with temperatures averaging in the mid-90s, while winters are mild with temperatures in the 50s. The city is situated on the southern shore of Joe Pool Lake, a reservoir that serves as a major source of drinking water for the area. Hydrology constituents in the lake include algae, bacteria, and various chemicals from runoff. Outdoor recreation opportunities in Duncanville include fishing, boating, hiking, and camping at nearby parks such as Cedar Hill State Park and Loyd Park. The city also has several local parks and a golf course.