A real classic! For smaller people it is quite hard because you lose the left foot doing the far move up with the left hand. I found a small intermediate left hand crimp that helped me with the move. For me one of the most beautiful and hardest 7a's I tried so far.
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.