In reply to gravy:
I went in November once. We might have just been unlucky but it was absolutely bloody baltic, way too cold to really enjoy it! It was impossible to climb anything that wasn't in the sun as the cold rock just leached any warmth out of your fingers. It was also impossible to retain any of your climbing warmth while belaying so we often ended up climbing a couple of routes then swapping over.
To make it worse, we were staying in one of those wooden huts at the campsite and it was a bit grim - there was no hot water for showers, the bedding they provided was really thin and you could never get properly warm. To add insult to injury, the heating stopped working on the last night - we woke up freezing at 3am and ended up packing up the car and driving back to Barcelona on the basis that at least the car would be warm once we got going!
I'm normally someone who prefers climbing in cool conditions and avoids climbing in the heat but I probably wouldn't head back there at that time of year, especially not without proper accommodation. I went back the following year around Easter and it was much nicer!