In reply to GrahamD:
> Because it isn't freezing cold all the time. Shelterd crags in the sunshine can be, and often are, comfortably warm.
I think most of the people who think there are plenty of warm enough days are retired.
> Also, from a personal standpoint, I don't particularly enjoy bouldering.
I often wonder whether people who don't like bouldering have tried doing microroutes somewhere like Slipstones? You can climb micoroutes at any grade all day at Slipstones (and many other crags) without a rope, nor any more risk than trad climbing (a similar level I would say). None of the standing still or being away from nice warm gloves/pockets for more than a few minutes, just loads of climbing compared to what would be possible with a rope.
Admittedly there aren't hundreds of crags that offer this type of experience, but in winter it makes for a much better day's climbing than freezing your bollocks off trying to do routes.