Irwin, Ohio is a small village located in the northeastern part of the state. It experiences a humid continental climate, characterized by hot summers and cold winters. Average temperatures range from around 25°F (-4°C) in winter to 85°F (29°C) in summer. Precipitation is evenly distributed throughout the year, with an average of 40 inches (102 cm) annually.

The village is situated near the Scioto River, which is an important hydrological feature in the region. The river provides water resources for the surrounding area and supports diverse aquatic life. Additionally, Irwin is surrounded by several small creeks and wetlands, contributing to the local hydrology.

Outdoor recreation opportunities in Irwin and its vicinity are abundant. The Scioto River offers opportunities for fishing, boating, and kayaking. The nearby Deer Creek State Park provides camping, hiking, and swimming opportunities, with a large reservoir for water activities. Other nearby parks and wildlife areas offer opportunities for birdwatching, hunting, and nature exploration.

In summary, Irwin, Ohio experiences a continental climate, has diverse hydrological features, and offers a range of outdoor recreation opportunities, making it an attractive destination for nature enthusiasts.