Once upon a time there was a global average temperature set call HADCRUT3.
HADCRUT3 loved 1998. 4 out of the top 10 warmest months were from 1998.
And then along came HADCRUT4 whose primary purpose seems to be to make sure the graph of the last 15 years slopes up instead of down.
HADCRUT4 hates 1998. Not only did 2 months from 1998 drop out of the top 10, but Jan 2007 was made .208C warmer than the old Jan 2007.
Why? I have no idea.
Paul Homewood has more. Take note of his footnote. There are no new stations in Antarctica. It looks like maybe 6 new stations south of the equator … and we know it is cooling in the south.