I've been cruising with Royal Caribbean for years now but always during late spring or summer time so weather wasn't really a concern. However, I'm looking to book a cruise for Christmas 2016 and debating between the Western Holiday sailing to the Eastern(money wise the eastern is more expensive since it's first holiday sailing for the Harmony). I was told by few friends and relatives that the weather on the Eastern Cruise at this time of year is "safer" and warmer then western and would like to know whats your input on that matter as I don't want to spend a week on board where temps are in the 70's. The western cruise I'm looking into leaves Cape Canaveral on Dec 23rd 2016 and stops at Labadee, Falmouth, Puerto Costa Maya, and Cozumel.
The weather in the Eastern vs Western at that time of year is the same. It has nothing to do with longitude - it has to do with latitude.
For example, the Bahamas are going to be a bit cooler than say Cozumel because Cozumel is a bit further south.
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I agree with Pete; once you get into the Caribbean Sea, the weather will be warm. Anywhere south of the Bahamas will be warm weather. I sailed Freedom of the Seas in December. We went to RCI private island in the Bahamas, St. Thomas, St. Maarten. Weather was in low to mid 80's in all three islands