Global Warming

I heard that after the 18 inches of rain that fell on Boulder in September, in one day, that this proves nothing about global warming.  It is "just" the 100 year flood, or maybe just a freak thing of weather.  OK.  Yesterday, Sardinia, an island in the Med, got 17 inches of rain in a day.  They are now as flooded as was Boulder, Colorado in September.  This is November.  Freak storms within two months of each other?  Maybe it is freak, but moving toward "pattern."