You got up and dressed in a warm house. Drove to the site in a warm vehicle. Got out, gathered your gear and climbed a tree stand...still warm. Sat more or less static for an hour.
Pretty accurate except the 'house' has no legitimate heating/cooling facilities and the room I sleep in lacks some of the higher end features like glass in the window next to my bed. Jeep kinda gets warm by the time I have to stop and start my 3/10ths of a mile hike up a steep hill. I keep my stuff unzipped on that and move slowly so I don't start sweating or spook stuff.
The thing that prompted me to make this post, though, was my feet. I went off and forgot my thicker socks and all I had were these damn 35 below aluminized whatevers I got from somebody for Christmas. They're thin, and my boots are uninsulated canvas type material, wolverine stock number W08324. I need another pair as these are wearing out after about 4 years, but aside from being uninsulated, they're awesome for everything else. Waterproof, lightweight, comfy, that sort of thing. Thick socks work well enough for colder weather, unless you leave them in the dryer along with your usual second layer clothing.
Those boots plus those 35 below things which did nothing to keep my toes warm led to some pretty numb feet, but the thing that got my attention was how abruptly my feet went from 'hey, we're actually kinda toasty right now' to 'damn, it's been a while since my toes have been this cold' starting right there at the point where the sun started to illuminate stuff. Next time I'm going to take a thermometer with me. Weather stations said the temperature stayed about the same from the time I got set up to the time my feet started complaining which was a little over an hour of sitting still, and the wind was not much different, either. That's why I was thinking biological, but who knows. Next time I probably won't forget my shit.
I did manage to fill my last tag with my muzzle loader this morning, though. 20 days of ownership and it has already put meat in the freezer =)