After being a seasoned traveler to Spain and living there for a short time, I thought I had the weather all figured out. As mentioned prior, it's hard to predict. I just returned and found that I was not prepared for the unusually cold weather not to mention SNOW. I would recommend the layer approach. You never know what you will find.
Enjoy!
Debbie
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Granada, tierra soñada por mí,
mi cantar se vuelve gitano
cuando es para ti.