Hi,
I am travelling with my 80 year old mother in December to the Caribbean on the Constellation. I have booked Concierge class and am wondering if it is worth the upgrade the the sky suite. This is the first cruise we have both been on so am unsure of the spaces we will encounter. If we were to upgrade, would it be better to do so before travelling or do it once we board the ship before sailing.
One other question, will it be Sleeveless top and bikini weather in December on board the ship or do the winds tend to be cooler.

Regards
Lorraine

Yes, It's worth upgrade the sky suite.
Sky suite ( SS ) class cabin is much better ( 251 sq. ft, veranda 57 sq.ft ) with bath tub.
; Concierge Class (CC) cabins has shower only ( 191 asq. ft , veranda: 41 sq.ft). You'd better switch it to SS now since most premium cabins will be sold out soon.

Caribbean temperature in December:
High: around 88, low: 60 for your reference.