The globe is on a hot streak, setting a heat record in June. That's after the world broke a record in May.
The US National Oceanic and Atmospheric Administration said last month's average global temperature was 16.2 degrees Celsius, which is .72C higher than the 20th century average. It beat 2010's old record by one-twentieth of a degree.
While one-twentieth of a degree doesn't sound like much, in temperature records it's like winning a horse race by several lengths, said NOAA climate monitoring chief Derek Arndt.
"We are living in the steroid era of the climate system," Arndt said.
Arndt said both the June and May records were driven by unusually hot oceans, especially the Pacific and Indian oceans.
Heat records in June broke on every continent but Antarctica, especially in New Zealand, northern South America, Greenland, central Africa and southern Asia.
The United States had only its 33rd hottest June.
All 12 of the world's monthly heat records have been set after 1997, more than half in the last decade. All the global cold monthly records were set before 1917.
And with a likely El Nino this year - the warming of the tropical Pacific which influences the world's weather and increases global temperatures - it is starting to look like another extra warm year, said University of Arizona climate scientist Jonathan Overpeck.
The first six months of the year are the third warmest first six months on record, coming behind 2010 and 1998, according to NOAA.
Global temperature records go back to 1880 and this is the 352nd hotter than average month in a row.
"This is what global warming looks like," Overpeck said. "Not record hot everywhere all the time, but certainly a reflection that the odds of record hot are going up everywhere around the planet."