A super classic slabby arete that needs precise footwork and a bit of optimism to pull off. If you're realistic about the chance of those footholds sticking, you're doomed. Convince yourself that they'll work, though, despite overwhelming evidence to the contrary, and you'll catch the jug at the top for sure.
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.