Carbon, particularly if it also has a carbon seatpost, often requires "assembly paste" to prevent slippage. This is a gritty paste that provided the needed traction and any bike dealer should have it.

Cold weather is no problem unless you are riding through liquid oxygen. Ride with confidence. Remember, a lot of newer aircraft are built with carbon composit panels, etc. and at high altitude they are subject to low temperatures we can't even imagine. For a more down to earth example (pun intended) some exotic and performance cars are also using carbon composite components and winter is no problem for them either.