Lynnville, Iowa is a small town located in Jasper County, in the central part of the state. The area experiences a humid continental climate, characterized by hot summers and cold winters. Summers are generally warm, with temperatures averaging in the mid to high 80s°F (30°C), while winters can be cold, with temperatures often dropping below freezing and occasional snowfall.

In terms of hydrology constituents, Lynnville is situated in the Mississippi River Basin, which is one of the largest river systems in North America. The town itself does not have any significant bodies of water, but it is surrounded by numerous rivers and lakes within a short driving distance. This provides ample opportunities for fishing, boating, and other water-related activities for outdoor enthusiasts.

Lynnville and its surrounding areas offer various outdoor recreational opportunities. The town is located near several state and county parks, including Rock Creek State Park and Lake Red Rock, which provide opportunities for hiking, camping, wildlife viewing, and picnicking. Additionally, the region has numerous trails for walking, biking, and horseback riding, allowing visitors to explore the beautiful countryside and enjoy the natural scenery.