Saint-Lucas, Iowa is a small town nestled in Fayette County, in the northeastern part of the state. The climate in this region is classified as humid continental, characterized by hot summers and cold winters. Average temperatures range from around 20°F (-6°C) in January to 80°F (27°C) in July. Precipitation is fairly evenly distributed throughout the year.

The hydrology of Saint-Lucas is influenced by the nearby Turkey River, which flows through the region. The river provides opportunities for water-based activities such as fishing, kayaking, and canoeing. It is home to various species of fish, including bass, trout, and catfish, attracting anglers from the area.

In addition to the river, Saint-Lucas and its surrounding areas offer several outdoor recreation opportunities. Nearby parks and natural areas provide opportunities for hiking, camping, and wildlife viewing. The picturesque landscapes, with rolling hills and lush greenery, make it an ideal destination for nature enthusiasts.

Overall, Saint-Lucas, Iowa offers a diverse climate, water resources, and outdoor recreational opportunities, making it an appealing destination for residents and visitors alike.