WMOMeanings1nounWorld Meteorological Organization; WMORefers to the United Nations specialized agency for meteorology, operational hydrology, and related geophysical sciences.See also: 世界気象機関WMOは気き候こう変へん動どうに関かんする報ほう告こく書しょを発はっ表ぴょうした。The WMO released a report on climate change.