Where do I buy a weather proof combination padlock?
I've had a cheap MasterLock for over a decade on my shed and it's not showing any signs of wear. Only downside is that they've been known to have a security flaw (a little internet searching will describe how to determine the combination with only a little trial and error). After a storm, I turn it sideways and the water just pours out, so it's definitely exposed to the elements.



For harsh elements, you may also want to look at an outdoors or boating store. Their locks are usually designed to resist salt water exposure: