"It is very likely that 2013 will be one of the warmest 10 years in the record which goes back to 1850, and it is likely to be warmer than 2012," it said in its annual forecast for the coming year. Next year was expected to be between 0.43 and 0.71C warmer than the long-term global average of 14 degrees (1961-1990), with a best estimate of around 0.57C, it said.
Its forecast is based on its own research as well as data from the University of East Anglia, the Nasa Goddard Institute of Space Studies and the US National Oceanic and Atmospheric Administration.
Rising temperatures could be due to the natural variability of the climate and global warming from increasing greenhouse gas emissions, Dave Britton, Met Office forecaster, told Reuters.
A warmer global average temperature does not necessarily mean every region of the world will get hotter, as regional climate variability produces different effects in different parts of the world, he added.