I use these to monitor humidity in all my showers. I have HomeSeer automatically turn off the bathroom vent fans based on the actual level. The fan is connected to a Z-Wave relay switch. It generally takes about 30 minutes to clear the humidity. It sometimes comes back on for a few minutes later. You never have to worry about mold with this setup.
And what happens when its 100% humidity outside? I've been to Alabama in the summer.