In reply to ankyo:
I've been asking myself this question most of this week. I haven't had a lot of luck, but then I was more looking at cleaning than climbing anyway. Highcliffe nab, a north facer that seeps was soaked, totally and utterly. Ingleby incline, a west facer that is exposed and seeps only a little bit was also soaked - by the end of this week totally wet all over. Danby Crag, a north facer in trees with some exposed buttresses, which tends to dry fairly quickly in summer was totally drenched all over.
Things that were dry - an overhung cavey bouldering dolerite choss quarry near kildale, with good drainage. Westerdale view quarry had some dry parts the other day, with some seepage. Just been back up there and it's roughly the same. Glaisdale was dry yesterday - well drained, but not that exposed.
I don't think Ravenswick will be dry, as it stays dry after heavy rain, but after a prolonged spell it seeps badly. I think the general rule is to pick somewhere that is well drained and hope!