Caribou, Maine experiences a humid continental climate with cold winters and warm summers. The city is located on the Aroostook River, which is a popular destination for fishing, kayaking, and canoeing. The river is also a source of drinking water for the city, and the hydrology constituents are closely monitored to ensure water quality. Outdoor enthusiasts can enjoy hiking and camping in the nearby Aroostook State Park, as well as snowmobiling and cross-country skiing in the winter months. Caribou hosts an annual winter carnival, and is known for its extensive trail system that spans over 300 miles and offers opportunities for ATV riding, snowshoeing, and snowmobiling.