Whereabouts in Morocco are you thinking of? What temp would be warm enough?

I did the tour of Imperial Towns between Christmas and New Year two years ago. I think you will have good weather in Marrakesh and might even venture into the swimming pool during the heat of the day, but you will need a woolly pully at night because it gets VERY cold - we experienced -7 to +24 degrees on a certain day .... but we did start off at 6 am!!

It would be too cold to swim in the sea in Agadir!!

Christmas is nice because it is not really in evidence being a muslim country. The bigger hotels do put up a tree and some decorations, but it seems incongruous in the sun, with palm trees and camels .......... though I'm sure that the palm trees and camels featured in the very first Christmas!!!