As you know, we just returned from the Zuiderdam cruise of 11/3-11/13. I usually am not bothered by too cool temps in the various public rooms, however, there were a couple of times that I wished I'd had a blanket, especially in the theatre. Some people had towels draped over themselves it was so cold. So, bring a sweater or sport jacket.
I'll bet those folks on the Carnival Splendor would have loved the cool temps.