California's Death Valley is the world's hottest place, according to the World Meteorological Organization. On July 10, 1913, Greenland Ranch in Death Valley recorded a surface temperature of 134 degrees Fahrenheit, the WMO wrote in an American Meteorological Society bulletin.Randy Cerveny, WMO's Rapporteur of Climate and Weather Extremes, told NBC News, "That record was investigated pretty thoroughly by Dr.