Saint Jo, Texas is a small town located in Montague County, in the northern part of the state. The town experiences a humid subtropical climate, with hot summers and mild winters. Average temperatures range from highs of around 95°F in summer to lows of 35°F in winter.

The hydrology of Saint Jo is primarily influenced by the nearby Red River. Several small creeks, such as Mustang Creek and Flat Rock Creek, flow through the area, contributing to the local hydrology. These water bodies provide opportunities for fishing, boating, and other water-based activities.

Outdoor recreation opportunities in Saint Jo are abundant. The town is surrounded by scenic landscapes, offering hiking trails, birdwatching, and wildlife spotting opportunities. The nearby Ray Roberts Lake State Park is a popular destination for outdoor enthusiasts, providing opportunities for camping, hiking, fishing, and boating. The park also features equestrian trails for horseback riding.

Overall, Saint Jo, Texas offers a pleasant climate, diverse hydrology, and various outdoor recreation opportunities, making it an attractive destination for nature lovers and outdoor enthusiasts.