In reply to SFrancis:
In reply to SFrancis:
May should be Ok for Asturias if you think is OK for climbing in say Cornwall or Devon. It is green "verde" for a reason. If you are going for 10 days, you should be absolutely fine, but you might miss a day or two due to rain. By the way, it would be the same any other time of the year.
Plenty of rock in the Picos for you to go, and plenty of options for hill walking or popping over to the coast if the weather is not great
Joaquin (born in Asturias)