Janesville, Iowa is a small town located in Bremer County, with a population of around 930 people. The climate in Janesville is classified as humid continental, characterized by warm summers and cold winters. The average high temperature in summer is around 84°F (29°C), while the average low in winter drops to around 11°F (-12°C). Precipitation is fairly evenly distributed throughout the year, with an average annual rainfall of about 34 inches (864 mm) and snowfall of approximately 30 inches (762 mm).

Hydrologically, Janesville is situated in the Cedar River watershed, with the nearby Cedar River being a prominent feature. The river provides opportunities for various water-based activities such as fishing, boating, and kayaking. Additionally, the area is known for its beautiful natural landscapes, offering opportunities for hiking, camping, and wildlife observation in parks like the Cedar Valley Nature Trail and the George Wyth State Park.

Overall, Janesville, Iowa offers a moderate climate with distinct seasons, and its proximity to the Cedar River provides outdoor enthusiasts with ample opportunities for recreation and exploration amidst the picturesque surroundings.