In reply to Pina:
Not been in winter, but I understand that
Rhoscolyn can be in good nick. It's a fantastic crag with brilliant big single pitches from around E1 upwards, some tidal, some not. Anglesey tends to get better weather than elsewhere, although I would guess there's still a significant risk of it being wet at this time if it hasn't had a couple of dry days. A true sea cliff experience but without the commitment of Gogarth, which is largely tidal and multipitch (and some of it is very adventurous, i.e. choss). That said, I think Castle Helen at Gogarth is still (relatively) popular in winter - it's the most conventional and accessible Gogarth crag and has excellent multipitch routes VS-E2. It's not really somewhere I'd like to be if it was cold and wet though...
I don't go climbing on sea cliffs in winter, but then I rarely get a rope on at all until April - you sound more intrepid. I'm also not sure I'd drive that far given the chances of everything being cold and wet on the basis that it's the UK in February, but there you go...
Post edited at 11:31