The Urban Heat Island of cities is well-known and is attributed to the high percentage of pavement and lack of trees. However, a new study by experts at the Yale School examined the urban heat effect and how it is affected by humidity. The study determined that some efforts to reduce the heat, either through trees or vegetation, were essentially erased due to the air’s moisture causing feel-like temperatures to soar. So adding trees increases shade and cooling due to evaporation, but the humidity the trees put into the atmosphere negate some of the cooling effect. This appears to be especially true in the humid South, where humidity is already high to begin with. You can read more at

Source: James Petts, Commons Wikimedia