Treynor, Iowa is a small town located in the southwestern part of the state. It experiences a humid continental climate, characterized by cold winters and hot summers. The average annual temperature is around 50°F (10°C), with temperatures ranging from freezing in winter to highs in the 80s°F (around 30°C) during summer. Precipitation is fairly evenly distributed throughout the year, with an average of about 32 inches (81 cm) annually.

In terms of hydrology constituents, Treynor is not situated near any major rivers or bodies of water. However, the region is dotted with small creeks and streams, which provide opportunities for fishing, canoeing, and other water-based activities. These waterways are home to various fish species, including bass, catfish, and trout, attracting anglers from the area.

Outdoor enthusiasts can also enjoy recreational activities in the surrounding natural areas. The region offers opportunities for hiking, biking, and camping in nearby state parks and wildlife management areas. With its scenic landscapes and abundant wildlife, Treynor and its surroundings provide ample opportunities for nature lovers to explore and enjoy the outdoors.