However, Central Park's trees do far more than just turn the city into a kaleidoscope of autumnal hues. During the summer months, they serve as a sort of air conditioner for the city. Because of the shade and water vapor provided by trees' quordle leaves, streets with tree-lined medians can be up to 10 degrees cooler than those without. There's no better way to keep New York City's residents sane than with trees. A walk in the park is one of the best ways to lift one's spirits and improve one's health and well-being, according to scientific research.