Saint-Clair, Missouri, is a charming city located in Franklin County. It experiences a humid subtropical climate characterized by hot, humid summers and cold winters. Summers are typically hot with temperatures averaging around 90°F (32°C), while winters can be cold with temperatures dropping to around 20°F (-6°C). The average annual precipitation in Saint-Clair is around 40 inches (102 cm), evenly distributed throughout the year.

The city is surrounded by beautiful natural landscapes and boasts various outdoor recreation opportunities. One such opportunity is the chance to explore the stunning Meramec River, which flows nearby. The river offers activities like fishing, boating, and canoeing, allowing residents and visitors to enjoy the water and surrounding scenery. Additionally, Saint-Clair is home to several parks and nature trails, such as Evergreen Park and Labadie Bottoms Conservation Area, where individuals can hike, camp, and observe wildlife.

Overall, Saint-Clair, Missouri, provides a climate that allows for diverse outdoor recreation opportunities throughout the year, ensuring residents and visitors can enjoy the beauty of nature in this scenic region.