Masonville, Iowa is a small town located in the northeastern part of the state. The climate in Masonville is characterized by four distinct seasons. Summers are warm with temperatures averaging around 80°F (27°C), while winters are cold with temperatures ranging between 20°F (-6°C) and 30°F (-1°C). Precipitation is evenly distributed throughout the year, with an average annual rainfall of 36 inches (91 cm).

The hydrology constituents of Masonville include the Maquoketa River, which flows through the town. The river provides opportunities for fishing, boating, and other water-related activities. It is home to various fish species, including smallmouth bass, catfish, and walleye.

In terms of outdoor recreation, Masonville offers several opportunities for nature enthusiasts. The town is surrounded by picturesque landscapes, making it ideal for hiking and camping. There are also nearby parks and trails for biking and horseback riding. During the winter months, residents and visitors can enjoy activities such as snowshoeing and cross-country skiing.

Overall, Masonville, Iowa provides a pleasant climate, diverse hydrology constituents, and ample outdoor recreation opportunities for residents and visitors to enjoy throughout the year.