Harlan, Iowa experiences a humid continental climate, with hot summers and cold winters. The area receives an average of 32 inches of precipitation per year, primarily in the form of rain and occasional snowfall. The Nishnabotna River flows through the eastern portion of the city and is a popular spot for fishing and kayaking. Other outdoor recreation opportunities include parks and trails, such as the Wabash Trace Nature Trail and the Harl-Anne Park. The city also has a public swimming pool and golf course. In terms of hydrology constituents, the city’s drinking water comes from a groundwater source and is treated to meet safety standards.