AP Photo/Nick Ut, File
FILE - This May 12th, 2014, file photo shows Thijs Talluto, 3, of Los Angeles, cooling-off in a fountain at Grand Park in downtown Los Angeles. U.S. Federal records show that for the second straight month, the globe hit a record high for heat. Driven by record warm ocean waters, May�s average temperature on Earth of 59.93 degrees Fahrenheit beat the old record set in 2010. The month before, 2014, tied 2010 for the hottest April on record. Records go back to 1880. (AP Photo/Nick Ut, File) Nick Ut/The Associated Press
Driven by exceptionally warm ocean waters, Earth smashed a record for heat in May and is likely to keep on breaking high temperature marks, experts say.
The National Oceanic and Atmospheric Administration Monday said May's average temperature on Earth of 15.54 C beat the old record set four years ago. In April, the globe tied the 2010 record for that month. Records go back to 1880.
May was especially hot in parts of Kazakhstan, Indonesia, Spain, South Korea and Australia, while the United States was not close to a record, just about half a degree warmer than the 20th century average.
El Nino weather event brewing
Georgia Tech climate scientist Kim Cobb and other experts say there's a good chance global heat records will keep falling, especially next year because an El Nino weather event is brewing on top of man-made global warming. An El Nino is a warming of the eastern tropical Pacific Ocean that alters climate worldwide and usually spikes global temperatures.
Ocean temperatures in May also set a record for the month. But an El Nino isn't considered in effect till the warm water changes the air and that hasn't happened yet, NOAA said.
With the El Nino on top of higher temperatures from heat-trapping greenhouse gases, "we will see temperature records fall all over the world," wrote Pennsylvania State University climate scientist Michael Mann in an email.
May was 0.74 C warmer than the 20th century world average. The last month that was cooler than normal was February 1985, marking 351 hotter than average months in a row.
This possibly could quiet people claiming global warming has stopped, but more importantly it "should remind everyone that global warming is a long-term trend," Princeton University climate scientist Michael Oppenheimer said.
Setting or tying monthly global heat records has happened frequently in recent years. The last global monthly cold record was set in December 1916.
Spring, which is March through May, was the second warmest on record globally, behind only 2010.
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