Sorry Giles wrong again, Spain in winter or anytime for that matter is not depressing it is rather nice I can asure you. That is why millions of north Europeans travel to the southern parts of the country and spend the winter months here - equivalent of the Canadian snow bunnies moving to the southern US. Granted it can get get cold (lowest on the Costa del Sol 5 deg at night) but no frost or ice to contend with.
Agree if you really want almost guaranteed good weather go on to the Canaries or Egypt is a much better bet but I know where I would rather be on a November morning - not in Milton Keynes, Canterbury or Walsall!