"We have looked further at data on the effect of global warming on the frequency of climate extremes, and have put this in a form that we intend to submit for publication (pdf).
We have added an illustration of how the perception of change of the frequency of extreme events depends upon the base period chosen for "climatology". This presents an additional reason why it is not good to continually shift the base period to the most recent 3-decade period, as that is very misleading, concealing the change of the frequency of extreme events. We argue that the base period 1951-1980 is logical, it is still within the Holocene range, and plant and animal life are adapted to that climatology.
This draft paper as well as all previous discussions and presentations can be found on my website." - Jim
Perceptions of Climate Change: The New Climate Dice
January 5, 2012: