Novemeber is the month where the possibility of rain is highest. The average rainfall at this time is 3 inches. In to January and February the chances of rain are less. In January the average rainfall is 2.8 inches... and 2.4 in February. It really can be pot luck with Spain. I know people who have gone there in Jan/Feb and returned raving about the weather and others who have been stuck indoors due to rain. So really it is hard to predict but it would be worth while to keep an eye on the
Weather pages as these will give you an up to date forecast.