How does humidity effect electronics in general? From the switches and knobs to the electrical connections on the external as well as internal components of a system?
If it's a good system the humidity shouldn't effect it much at all. Leave it all out in the rain, where the humidity is at 100%, and that's a different story.
Internal components should be protected, making it a non-issue. External components may be affected in very high humidity levels. I certainly wouldn't want to leave my system outside here; the humidity is always high.