Researchers say September was the warmest on record. The National Oceanographic and Atmospheric Administration said that the global temperature in September was 60.21 F, about 1.21 F above the 20th century average for September. It marked the 331st month in a row that global temperatures were above the 20th century average.
The last one found below the 20th century average was February 1985.
The NOAA report said that the higher-than-average temperatures occurred mostly in southern Greenland, Paraguay, northern Argentina, western Australia, Japan, Russia and Canada. The U.S. itself was not particularly warm in September, however, being only the 23rd warmest September on record.
Arctic sea ice was also the the smallest it's ever been in recorded history at 1.39 million square miles in September.
"The Arctic is plumbing new depths, completely leaving the rest of the record behind," said Deke Arndt of NOAA. "There kind of aren't enough superlatives to describe what has gone on there over the last five or six years."