FYI some Grenoble crags to look at
for:
Oct-April, up to 5.13c:
St. Nizier/Rocher de l'ane
Le desert de l'écureuil (chossy but fun. Only one 13c for you)
Narbonne
Goupil
Mur de Satan (ALL hard)
L'Abbatoir
Les Saillants
St. Ange
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April, 6's:
Le desert de l'écureuil
Jardin suspendu (big chunk might have just fallen off)
Coup de Sabre
St. Nizier/Rocher de l'ane
St Paul de Varces
Les Saillants
The Vercors is a different (better) story but some places to look are: Auberge Espagnole, Ombleze, la Crique, le Degueloir, Goulandiere, Precipice de Corbiere. Once it gets wet, it generally takes ages to dry though because of seeping rock. A car is pretty much required for the Vercors if you are in Grenoble.
Easyjet has really cheap flights from Milan (4ish hour drive from Grenoble) to Athens (most of the year) and Kos (July-end of Aug) -- just sayin :)