the ACE index(Accumulated cyclone energy) is perhaps the best way to judge a season...you take the storms winds in kts, square it, then divide by 10000...during the four main NHC updates..then total these up from all the storms
INFO HERE The median ACE index is 89.5 2005 was the record with 248, 2006 was only 79
a 100kt hurricane would add a full point every 6 hours..a 140kt Cat 5, 1.96