Melvin, Texas is a small rural community located in McCulloch County. It experiences a humid subtropical climate characterized by hot summers and mild winters. The average high temperatures during summer range from the mid-90s°F (35°C), while winter temperatures typically range from the mid-40s°F (7°C). Melvin receives an average annual rainfall of around 28 inches, with the majority of precipitation occurring during the spring and fall months.

The hydrology constituents of Melvin primarily consist of the Colorado River. The river provides a source of water for agricultural purposes and also supports various forms of wildlife. Additionally, several creeks and small bodies of water are found within the surrounding area.

Outdoor recreation opportunities in Melvin include activities such as fishing, boating, and hiking. The Colorado River offers fishing enthusiasts the chance to catch a variety of species, including bass, catfish, and sunfish. Boating is popular, allowing visitors to explore the river's scenic beauty and engage in water sports. The surrounding landscape provides opportunities for hiking and nature walks, allowing visitors to immerse themselves in the natural beauty of the area.

In summary, Melvin, Texas offers a humid subtropical climate, with hot summers, mild winters, and moderate rainfall. Its hydrology constituents are primarily comprised of the Colorado River, providing water resources and supporting wildlife. Visitors can enjoy outdoor activities like fishing, boating, and hiking, making it a great destination for nature enthusiasts.