The monthly anomaly of the global average surface temperature in May 2014 (i.e. the average of the near-surface air temperature over land and the SST) was +0.31°C above the 1981-2010 average (+0.68°C above the 20th century average), and was the warmest since 1891. On a longer time scale, global average surface temperatures have risen at a rate of about 0.69°C per century.
1st. 2014(+0.31°C), 2nd. 1998(+0.27°C), 3rd. 2010(+0.23°C), 4th. 2012(+0.22°C), 5th. 2013(+0.21°C)