If it looks fine it should be OK. I have no experience with freezing temps but one of the best places to grow phals in my country is in the highlands. altitude 5000 - 6000 feet, where the night temps are in the 50 - 60F. Here in the highland hill stations phals are grown for the cut flower trade.The name of your orchid should be should be written Phalaenopsis (Phal) Orchid World. The grex should be in capital letters since it is a hybrid.