According to the new data published by NASA, 1998 is no longer the
hottest year ever. 1934 is.
Four of the top 10 years of US CONUS high temperature deviations are now from the 1930s: 1934, 1931, 1938 and 1939, while only 3 of the top 10 are from the last 10 years (1998, 2006, 1999). Several years (2000, 2002, 2003, 2004) fell well down the leaderboard, behind even 1900.
(World rankings of temperature are calculated separately.)
Of course, you won't be hearing about this during the leftest newscasts or in the NY Times any time soon. As a scientist I have been suspicious of the basic data collection that was used to gather the data. Turns out much of the measurement stations are not quite up to standards. Good measurements are the basis of good science and there are lots of examples where we have not started gathering good data to determine if global warming is real or not. Much of the world is relying on urban temperature measurement points that have substantial biases from urban heat.
More here. I didn't realize Mann was not a statistician, though I am not at all surprised based on my analysis of his work.