Was 7 degrees here this morning on my way to work which is still in winter tyre territory. I wouldnt be in such a hurry to remove them yet, as said above, this time last year we had a lot of the white stuff, so might still get more yet. I'd wait a while yet - like Feb / March time. That said, what kind of mileage do you do? I assume if the temps are on the edge of what they like then they might wear quicker?