Just so it's said: hypothermia isn't specific to freezing temps. I've said it here before and I'll say it again, I sweat, a lot, and can't seem to help it. Been that way since puberty, ergo: I may be damp and not even notice it really. As I dropped into camp during a winter hike a couple years ago, I was warm and feeling great. It was a breezy 40 deg or so. As the "bite was on" (as we say) I immediately started fishing, wandering a ways away from camp and my pack. Quite literally from one minute to the next I realized I was having a TON of trouble tying a basic knot (no shivering). That caused me to look "big picture" at the last ten minutes or so. I realized I'd been very lethargic, tunnel-visioned and a little unsteady on my feet. THEN I realized I was damp and pretty cold. I did a couple jumping jacks in place and carefully made My way back to my pack and some dry clothes. All the difference in the world and the fishing stayed great.
Summary: no icicles to be seen, only sunshine. I had no concept I was damp or cold. Although it kinda snuck up on me, it took an "A-ha moment" to see what was going on. I was far enough from insulation that it could have been a real issue if I hadn't caught it. Behavior modification: unless it is LEGIT hot / warm out: I ALWAYS change clothes after dropping into camp, almost right away.
I am NOT going out like that.
Great thread. Thanks!