It can be cold wet,and windy. I have been in Tunisia with snow on the ground. On the other hand, if you are fortunate, the weather can be mild and Springlike. Be prepared for anything.
I am sorry if this disappoints you but it can be rough and cold in the Med. in January. Sea conditions from October to May can be bad, I have been in really bad storms in both of these months but it can also be pleasant and the closer you get to Cyprus and Egypt then the warmer conditions can be but for the rest don't expect too much warmth. On the plus side most of the ships are great at weathering inclement weather nowadays. Nei.
Can anyone tell me about weather in the Mediterranean during late November to early December? I will be traveling on the Jade from Rome to Turkey.