We drove up to Puerto de la Cruz just after Christmas. It was cloudy, windy and rather chilly. The Trade Winds were blowing dark clouds inland which had to rise as they approached the hills outside the town and as they rose further they deposited rain all over the north of the island. By the time those clouds reached Los Gigantes in the south west they would have shed most of their moisture.
I read recently that as a consequence of global warming, the Trade Winds would permanently change direction resulting in black clouds crossing the south of the island, heading north and raining all the way to Puerto de la Cruz which will become a lot dryer and warmer. And unfortunately, Los Gigantes will become cloudy, windy and rather chilly- but not for the next three weeks!