I'm not sure where you got your information from, but the Fifth IPCC report (the latest I could find) states on pages 46 to 50, under the heading "Changes in Extremes" that: 1) Heavy rainfall events over land have increased in more regions than they've decreased; 2) The number of cold days and nights has decreased and the number of warm days and nights has increased on the global scale between 1951 and 2010; 3) The length and frequency of warm spells, including heat waves, has increased; and 4) Since the 70's it is virtually certain that the frequency and intensity of storms in the North Atlantic have increase.