Why Smooth Surfaces Make Your City Sizzle in SummerRobert Sorokanich7/10/14 12:40pmFiled to: summerurban heat islandsheatcitiesurbanismglobal warmingshutterstock111EditPromoteShare to KinjaToggle Conversation toolsGo to permalink It's not just you, city-dwellers. Urban areas actually do get noticeably hotter than the rural areas around them, and that's especially problematic in summertime. Why does that happen? Well, a new study says it all has to do with the aerodynamic shape of your city. In other words, the smoother your skyline, the hotter you'll get. The study, published this week in Nature, takes a new look at the familiar phenomenon of hotter temps in cities. Previous theories held that increased city temps were due to a lack of vegetation (which can cool the local environment through water evaporation) or building materials that absorb heat from baking in the sun all day and release it at night, or even tall buildings that trap heat with reflective facades.