Merrillan is a small village located in Jackson County, Wisconsin. The climate in Merrillan is characterized by cold winters and warm summers. Average temperatures range from the low 20s°F (-6°C) in winter to the high 70s°F (around 25°C) in summer. The area receives an average of about 30 inches (76 cm) of precipitation annually, with the majority falling as rain during the summer months.

As for hydrology constituents, Merrillan is situated near the Black River, which is the main waterway in the region. The Black River is known for its diverse fish population, including walleye, smallmouth bass, and northern pike. Additionally, the river provides opportunities for boating, kayaking, and canoeing.

Outdoor recreation enthusiasts can enjoy several activities in and around Merrillan. The area features numerous hiking trails, such as the Black River State Forest Trail, which offers scenic views of the river and surrounding forests. Additionally, there are opportunities for hunting, wildlife observation, and camping in the surrounding natural areas.

Overall, Merrillan, Wisconsin, offers a moderate climate, access to the Black River, and various outdoor recreation opportunities, making it an attractive destination for nature lovers and outdoor enthusiasts.