22 October 2015. This September was the hottest ever recorded worldwide, making the seventh monthly record set this year and setting 2015 on course to be the hottest year in recorded history. The US National Oceanic and Atmospheric Administration calculated a global temperature for September of 60.62F (15.9C), beating the record set in 2014.

THE GUARDIAN

http://www.theguardian.com/science/2015/oct/21/warmest-september-ever

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