We did the Conquest over New Years leaving on December 31st and it was perfect. The weather was a little cool leaving Galveston, but it wamed up quickly and we went swimming at each port. A fantastic time to go cruising.
Enjoy!
__________________
Ron and Sue Carnival Ecstasy
NCL Sunward II
Carnival Paradise
NCL Dream
Carnival Elation
Carnival Conquest
Golden Princess
Hurricane season officially ends on November 30. While not impossible to have a hurricane in early December it would be considered very rare.
__________________ Carnival Freedom
Back to Back Carnival Freedom
Inspiration - June, 2007
Carnival Valor - May, 2007
Carnival Glory - August, 2005
Carnival Glory - April, 2004
Carnival Destiny - April, 2001
Carnival Destiny - April, 2001
Sensation - September, 2000
Paradise - June, 2000
SS Norway - May, 1996
Fantasy - November, 1993
SS Norway - May, 1993
Here's a couple links to average monthly temperatures in Grand Cayman and Cozumel. You might also be able to find MoBay's average on that site, but it'll be similar to the others.