In this Tuesday, July 24, 2018 photo, hikers beat the heat on the trails at first light in Phoenix as temperatures exceed 95 degrees before sunrise. Phoenix on Tuesday recorded a sweltering 116 degrees (46 Celsius), tying the previous record set for the day in 2014. Officials in Phoenix and other cities are tackling urban warming caused by vast amounts of heat-retaining asphalt and concrete and too little trees. (AP Photo/Matt York)