In reply to GridNorth: I would agree with this,
You need to be able to react to changes in the weather, if you plan on doing a set number of routes, you'll do maybe one or two, but if you're flexible you can adapt and travel around to slot routes into weather windows.
Heading up to the rouge is the weather is bad on the Midi side can be a great way of slotting some nice climbing in, doing routes like the cheer couloir on days where the weather is due to turn bad in the evening gives you a good option too.