Chantilly, Virginia is a suburb located in Fairfax County, just outside of Washington D.C. The climate in Chantilly is humid subtropical, with hot summers and mild winters. The town is situated between the Bull Run and Cub Run watersheds, which are part of the Potomac River watershed. This makes water quality a concern, with pollutants from urban and agricultural runoff potentially affecting the river system. Despite this, there are still opportunities for outdoor recreation in Chantilly. The area offers several parks and trails, such as the Ellanor C. Lawrence Park and the Washington and Old Dominion Trail, which provide opportunities for hiking, biking, and other outdoor activities.