Moisture is not such a problem, you can even wipe over it with a damp cloth, but sunlight fades the labels very quickly.

I had stuck a label on a rental ski with my son's name on it. It turned completely pink in 3 hours, and after 6 hours a layer came off. Wiping off water drops quickly is possible, but longer exposure to moisture is not. A label in the house is unchanged after 3 years. Outside you can forget about it...