I am not joking !We live in Murcia, and it is very cold indeed at the moment, less than 4 degrees.3 sharp frosts recently.
It can be nice during the day, but when cloudy,and at sunset, temperatures drop steeply.
Most properties are not insulated, and along with tiled floors and walls , it is like a fridge in the evenings.
Many places do have heating, but it can be expensive to keep on all the time
If you want a mild winter the Canary Islands are best, with a warmer, more even year round temperature.