Anthony Watts has more analysis regarding the NCAR study of the maximum temperatures versus minimum temperature ratio. Anthony's post parallel the analysis that appeared here yesterday and reinforces the observation that:
If you were to only look at the ratios of maximum to minimum monthly temperature records, it would be understandable to draw the conclusion that, while there was a cyclical pattern to the ratios, the ratios were increasing exponentially toward a much hotter environment...
It is only when you compare the absolute number of all-time records that you appreciate that ratios as a measure of global warming may be quite deficient.