[smileyman]

Tire temps are important. Cold weather pressure need be slightly lower, tire warmers are nice to keep the opening lap sliding to a minimum. If not start out really timid until lap 2-3 when they get warmed up. Soft compounds are better in the cold (I will not get into cold tearing issues for a track day) but you have to really work a DOT race compound hard to get it warm, a soft street tire would be my pick.

Next your suspension will not behave quite like you think in the early morning temps. Fork and shock oil will be cold and will give a firmer feel w/ slower motion.

Your brakes will need to get up to temp as well although they are going to bite, it will take them a lap or so to build heat and lever feel.

Your body will be stiff and if you ride stiff you will unknowingly effect your chassis and handling. Loosen yourself up before you get out of pit lane, jog in place, stretch, jumpin jacks.

Finally the track temps will vary. First stint will be colder and slicker, the more the sun gets on the track and heats it the more rubber gets put down it will come up to grip for you. Late in the day as temps drop you need to mind yourself and your setu p all the more (cause your mind and body are adjusted to the warmth and slowing down your pace is harder than speeding it up!)

Have fun at all times - fun equals loose equals safe.