I have a 25 foot 16/3 extension cord. The instructions say it should not be stored outside, but it doesn't say why. I would like to store it out in the open under my carport. It would not get hit with rain or much direct sun, but it would be exposed to wind. It would not be left plugged in (although incidentally I don't understand why this also isn't allowed).
Is this safe, and what is the actual reason for preferring to store it inside?