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I have done a lot of this kind of driving on my PS (first set) and PS2's (current tires), since I try to get the car out early in April, and keep it out into late October. The first couple hours in the early morning (low-low 40's) can be a little tricky! This is when the air temperatures are at their lowest point, for the day.
When the sun comes out and starts warming the road up, it is a very big difference. Or until you can get some heat built-up into the tires.
Another thing to consider is that for every 10 degree temp change, there is a 1 PSI impact on the actual cold-tire pressures. I find that our car/tire combo (especially in 19" wheels) is very sensitive to having a proper cold-tire pressure. So, a 1/2 or 1 PSI change makes a difference in the car's handeling.
In Hops example, the temp he departed at was 49 and when he got to the highest elevation the air temp was 32. If the tires had an opportunity to cool down, I would suspect that you lost at least 1-1.5 PSI. IMHO, this had a major impact on the car's shift in handeling too.
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