The United Nations-linked body said today that June 2016 was the 14th consecutive month of record heat around the planet and the 378th consecutive month with temperatures above the 20th Century average.
The organisation said that global warming causing carbon dioxide concentrations, so far this year, have surpassed the symbolic milestone of 400 parts per million in the atmosphere.
"Another month, another record. And another. And another. Decades-long trends of climate change are reaching new climaxes, fuelled by the strong 2015/2016 El Niño," said World Meteorological Organisation Secretary-General Petteri Taalas said in a statement.