I can't say what the weather will be and by what you have said it does not seem bad at all right now. There are open albergues in Rabanal del Camino and Foncebadon. If they do not answer your emails, try whatsapp and call. It is pretty easy. When it comes to the weather, going up towards Cruz de Ferro I would follow the advice of the hospitaleros or the locals whether or not you have any question about the weather. Always good to ask when you are going into higher elevations. Molinaseca shows 3 open albergues. Check to make sure they are open. I have walked in the lowest of seasons, winter and never had a problem finding an open albergue.