Cottage Grove, Minnesota, experiences a humid continental climate characterized by distinct seasonal variations. Summers are warm and wet, with average high temperatures reaching 82°F (28°C) in July, while winters are cold and snowy, with average lows around 10°F (-12°C) in January. Precipitation is fairly evenly distributed throughout the year, with June typically being the wettest month, averaging 3.74 inches (95 mm) of rainfall.
Protecting natural resources is a priority for Cottage Grove residents. The city is part of the South Washington Watershed District, and its Management Plan outlines strategies to safeguard local ponds, wetlands, and the Mississippi River. Public education on environmental issues is also emphasized, with the city publishing environmentally-focused supplements in the Cottage Grove Reports newsletter.
Water conservation is another key focus. Cottage Grove’s water supply comes from the Jordan and Prairie du Chien-Jordan aquifers, accessed through 12 wells. Residents are encouraged to conserve water to ensure sufficient reserves for emergencies and to protect the interconnected groundwater and surface water systems. The Public Works Department offers resources for proper disposal of household waste to prevent pollution.
In recent years, the city has addressed concerns related to per- and polyfluoroalkyl substances (PFAS). The Environmental Protection Agency (EPA) updated health standards for PFAS in April 2024, setting new Maximum Contaminant Levels. Since 2017, Cottage Grove has supplied residents with water meeting all state and federal health-based guidance, constructing interim treatment plants and planning permanent facilities funded by the 3M Settlement.
Understanding Cottage Grove’s climate and participating in local environmental initiatives are essential for maintaining the community’s health and sustainability.