i commute year around, including well below freezing weather - carry a lezyne alloy drive hand pump - it easily gets 60 psi and has worked fine in cold weather, keep it in a plastic bag. changing a tire when it is -10 C isn't fun, i've broken a couple of brittle plastic tire levers - a "Quickstik" has worked well.
Last edited by martianone; 08-13-12 at 08:14 PM.