July at least equalled, if not surpassed, the previous hottest month recorded in July 2016, according to preliminary data from the World Meteorological Organization and Copernicus Climate Change Service, or C3S.

"We have always lived through hot summers. But this is not the summer of our youth. This is not your grandfather's summer," said United Nations Secretary-General António Guterres, who announced the data in New York on Thursday. "All of this means that we are on track for the period from 2015 to 2019 to be the five hottest years on record."

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