In reply to Davey_HB:
I've been to Rjukan twice this year (first time mid-December; second time this weekend just past).
Even with the warm spell that they've had, there's still ice to be climbed.
Sure, a lot of routes aren't formed yet, but if you're going anyway, you can make it work.
A couple of the routes at Ozzimosis were better in December, but most routes at both Ozzimosis and Krokan were better this time around (more ice, and not as hard or brittle - better sticks all around).
I haven't been to any of the other crags.
As said, the Climb Rjukan/Tinn Facebook group is your best chance of finding out about the latest conditions. I've posted a few pictures from this weekend there if you want to take a look
I'll be back on the 11th of February for a few days: I will be posting pics of the conditions on the group
Post edited at 15:50