The April figures released by NASA continued the remarkably warm start to 2016, with each month among those over the most abnormally hot months in more than 130 years of global figures.
"We knew an El Nino would impact things, but I don't think anyone expected this jump," Eric Holthaus, a meteorologist told 'The Independent'.
The increases measured by experts around the world meant that within the last year, global temperatures had increased by 25 per cent of the total increase since the 1880s, Holthaus said.
In such circumstances, the corals expel the algae living in their tissues and turn white. While coral can recover from such events, it is often fatal.
Holthaus said the record temperatures may continue up to six months, after which they would begin to level out.