Modesto, California is located in the Central Valley and experiences a Mediterranean climate. Summers are hot and dry, with average temperatures ranging from the high 80s°F to low 100s°F. Winters are mild, with temperatures averaging in the mid-50s°F. Modesto receives about 13 inches of rainfall annually, primarily occurring during the winter months.

As for hydrology constituents, the Tuolumne River runs through Modesto, providing a valuable water source for the city's agricultural activities. The river also offers recreational opportunities like fishing, boating, and kayaking. Additionally, Modesto has several parks and lakes that provide opportunities for outdoor activities such as hiking, biking, picnicking, and bird-watching.

Some notable outdoor recreation spots in Modesto include the Modesto Reservoir Regional Park, where visitors can enjoy camping, fishing, and boating. Dry Creek Regional Park offers hiking trails, picnic areas, and wildlife observation. The Virginia Corridor Trail is a popular walking and biking path that stretches through the city, offering a scenic and active way to explore Modesto.

Overall, Modesto's climate, hydrology constituents, and outdoor recreation opportunities make it an appealing destination for nature enthusiasts and outdoor lovers.