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Probably a combination of all the above! Definitely insufficient food (take more snacks), possibly insufficient hydration, altitude may contribute. I suspect your biggest problem may have been too much clothing at the start.
You state you tried to avoid sweat, but you also say in your subject line that you were cold AND WET. "Wet" is the key. Since there was no precipitation and you presumably didn't fall into a body of water (I've done that!) or wallow in wet snow, the only possible source of "wet" was your body. I suspect that you got too sweaty (because of too much clothing) in the early part of the climb so that your inner clothing was damp (which, with synthetic wicking fabrics and your mind on the climb, you often don't feel). The wind then evaporated the sweat and made you cold. In those conditions, I would have started (and possibly completed) this climb in just a base layer, wind shirt and a headband to keep my ears warm. Anything more (including hood or even gloves at the start) and I would be soggy with sweat. Sweat is just as dangerous as any other form of moisture; I've found that it's better to be a bit on the cold side while actively moving. Of course when I stop, I pile on puffy jacket, hood and gloves and use a sit pad, but those go back in the pack as soon as I start moving again. Going downhill, I may add a light layer and possibly hat and gloves.
Here's an excellent BPL article on thermoregulation: http://www.backpackinglight.com/cgi-bin/backpackinglight/00184.html
It might be worth your while to plan to spend a few days in a cool climate just experimenting with regulating your own body temperature at temps ranging from 7 to 2 degrees C (~45-35*F) with varying degrees of activity. Consider wearing a cotton T shirt for some of these experiments (not too far from your lodging) so that you can more easily feel your body moisture. That's basically what I've done and learned on my daily walks near home (I live in a far more temperate climate than yours).
Edited by hikinggranny on 11/05/2012 12:59:40 MST.
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