They are the same.... completely unpredictable. 
Sorry to sound so flip but that question is not answerable unless you want a lie.
I'm not even sure a "normal seas" statistic is kept. But you could try googling for it.
Sorry we can't be of help on this question, but do try another. Welcome to Cruise Chat!
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Carnival Cruise Lines:
Fantasy 90, Celebration 95, Victory 05, Conquest 05, Spirit 6/06, Freedom 6/08, Holiday 7/08, Victory 6/09, Valor 9/09, Dream 6/10, Splendor 8/10,Conquest 8/11,Magic 11/11,Triumph 4/12,Spirit 7/12,Freedom 11/12, Triumph 2/13 - The fire cruise
NCL Dream October 2006, RCCL Mariner OTS June 2007
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