Arlington, Virginia experiences a humid subtropical climate with hot summers and mild winters. The area receives an average of 44 inches of rainfall annually with occasional flooding events. Arlington's hydrology is primarily influenced by the Potomac River which runs along its eastern border. The Four Mile Run and Lubber Run are the two main streams that run through the area. Outdoor recreation opportunities in Arlington include hiking and biking trails in the nearby Great Falls Park and Theodore Roosevelt Island, as well as kayaking and paddleboarding on the Potomac River. The county also offers many parks and playgrounds, including the popular Long Bridge Park, which features a boathouse and fields for sports.