This was our first try at a Thursday meetup, so we had a nice small group of fun people, mostly traveling climbers and a few locals that were able to get the afternoon off work.
Rain sucks, but broken holds suck even more. Remember, never climb on wet rock in Fontainebleau.
The sandstone becomes brittle, and pulling on it will ruin classic problems. Drying it doesn't help, because it's still wet and weak inside.
All you can do is wait for better conditions.