I've put this here as a future search reference. We stayed at the Riu Palmeraie early December 2011. During the day it was warm or hot and sunbathing between 10am and 4pm was the norm. We got a nice tan. Evenings got chilly. Ladies will need a cardigan. Walking in Marrakech was fine during the day and again was chilly by night. There was a cool breeze coming from the snow covered mountains one day that put a chill in the air but that was once in eleven days. Whilst we did not use the heater in our room, some people may want one so check each hotel in advance. The general weather was hot but not unbearable by day and cool but not freezing by night. The swimming pool was freezing.