I spliced 120V AC wires coming to the lamp so that I would have electricity for the USB adapter that would power USB camera (USB is used only to power the camera. The actual data transfer happens over WiFi). I put the USB adapter behind the black metal thing that attaches lamp to the wall.

While everything is under the roof and should not directly get in touch with water I still had this "awesome" idea to wrap the USB adapter into a plastic bag "just-in-case" water would somehow get there. However, now I am having second thought about this awesome idea because I am afraid that the plastic bag could actually facilitate condensate to form on the adapter and possibly damage it.

1. How worried I should be about using plastic wrap around the USB adapter (note, that this is dry California)? Would plastic wrap actually allow condensate to form and possibly cause short in USB adapter?
2. The USB adapter had a warning notice that explicitly mentioned that it is intended to be used only indoors. Just to be on the safe side, should I be worried about using indoor electronics in the way I did under the roof? Why?