Sullivan is a small village located in Jefferson County, Wisconsin. It experiences a humid continental climate, characterized by warm summers and cold winters. The average temperatures range from around 20°F (-6.7°C) in winter to 80°F (26.7°C) in summer.

The village is situated near several lakes and rivers, including the Bark River and the nearby Scuppernong River. These hydrological features provide ample opportunities for outdoor activities such as fishing, kayaking, and boating. The Bark River State Wildlife Area, located just south of Sullivan, offers additional recreational opportunities, including hunting and wildlife observation.

Sullivan is also surrounded by beautiful natural landscapes, including forests, prairies, and parks. Kettle Moraine State Forest, which is adjacent to the village, provides a variety of outdoor recreational activities like hiking, camping, horseback riding, and cross-country skiing, depending on the season.

In conclusion, Sullivan, Wisconsin, offers a pleasant climate with distinct seasons and is blessed with various hydrological features like rivers and lakes. Its proximity to natural areas and state parks provides ample opportunities for outdoor activities and recreation all year round.