Rainfall is evenly distributed throughout the year with an average of 33 inches annually. The Ecorse River flows through the city, and there are also several smaller creeks and streams. The city is home to several parks, including Champaign Park and Allen Park City Park, both of which offer outdoor recreation opportunities such as playgrounds, sports fields, and picnic areas. The nearby Rouge River also provides opportunities for fishing and kayaking. Overall, Allen Park offers a variety of outdoor activities for residents and visitors.
Allen-Park receives approximately 863mm of rain per year, with humidity levels near 80% and air temperatures averaging around 10°C. Allen-Park has a plant hardyness factor of 6, meaning plants and agriculture in this region thrive during a short period during spring and early summer. Most plants will die off during the colder winter months.