More to your point: It's a matter of weather... see my recent post here on ScubaBoard at
http://www.scubaboard.com/t84106-.html
The months you mention, certainly even well into February... it's the end of the "rainy season".
This wekend, January 15... note with care what happend to the weather in Mexico, Belize and the Bay Islands... as cold arctic air pushes South as far as Texas, see what happens to the tropics! The dive sites and operations that are exposed to the "Norther" Storms (in Roatan, anything but the South side) are getting pounded.
If you charter with anything other than a South side dive op (SubWay, FIBR, CCV, etc), you would be lucky if they had their act together enough to ferry you and your gear over to the South side and meet up with their dive boat already moored there.
Very lucky.
Go and check out the ScubaBoard post referenced above.
Just a point of information, CCV takes you considerably East, not only to the delightful Calvin's Crack, but to dive sites that are pretty much exclusive to CoCoView's reach. The areas of South side diving that most are familiar with are but the
tip of the iceberg. Unless you have your own boat to dive from, I would say that the "quality" absolutely depends upon the operator selected. Got your own boat? I've got the dive sites/gps coordinates... pm me.