BBC: February and March this year showed greater departures from the norm.
The new record for April trounced the previous one, set in 2010, by 0.24C.
"The very unfortunate circumstance we have now is the overlap of a very intense El Nino that has been magnified by climate change," said Christiana Figueres, executive secretary of the UN Framework Convention on Climate Change.
Click here to see how the Earth's surface temperatures from 1880 to 2015 compare to the 20th century average
"All of...