Jefferson, Iowa is a charming city located in Greene County in the central part of the state. The climate in Jefferson is classified as humid continental, characterized by hot summers and cold winters. Average temperatures range from around 20°F (-6.7°C) in winter to approximately 85°F (29.4°C) in summer.

As for hydrology constituents, the city is not situated near any major rivers or lakes. However, there are several smaller creeks and ponds scattered throughout the area, contributing to the local ecosystem and providing opportunities for fishing, boating, and other recreational activities.

Outdoor enthusiasts in Jefferson can enjoy a variety of recreational opportunities. The city boasts several parks, including the Jefferson City Park, which features trails for walking and biking, picnic areas, and sports fields. Additionally, the Raccoon River Valley Trail is a popular destination for hiking, biking, and birdwatching, offering stunning views of the surrounding landscapes.

In conclusion, Jefferson, Iowa experiences a continental climate, with diverse hydrology constituents including creeks and ponds. Residents and visitors can take advantage of the numerous outdoor recreation opportunities, from exploring local parks to enjoying the scenic Raccoon River Valley Trail.