it´s almost always windy for at least part of the day, all year around.
It is said "the landscape of Castilla is in the sky." Summer and Fall bring huge skies full of fabulous clouds and colors, including the brightest, clearest blue you ever saw. The meseta is pretty high-altitude, and the air is clean and clear.
In September and into October, the meseta is dusty brown, as the fields are all cut and the stubble is dried out. When the wind blows, the whole world is coated in golden brown. It´s a mercy when the rain starts up, because it tamps down the dust and gets the winter catch-crops growing. By November the fields are green again, and continue that way right through July.
IMHO, the months of August, September, and into October are where people get the impression the meseta is a great desert. The rest of the year it´s really pretty nice out here.