Hartland, Wisconsin experiences a humid continental climate with warm summers and cold winters. The area receives an average of 34 inches of precipitation annually, with most falling in the form of rain during the summer months. The town is situated near several lakes and rivers including Lake Nagawicka, the Bark River, and Pewaukee Lake. These bodies of water provide ample opportunities for outdoor recreation such as fishing, boating, and kayaking. Additionally, Hartland boasts several parks and trails for hiking and biking, including the Ice Age Trail and Nixon Park. The hydrology constituents in the area include phosphorus and nitrogen, which can lead to algae blooms and water quality issues in some bodies of water.