Wow! At what point do you start worrying about your lungs freezing? (Not to mention your nose hairs!)
Charlie,
On Friday at 6 degrees, me and my buddy really didn't have a problem on the hike other than ice underfoot. Forgot my spikes and he doesn't own any. Once we started down and weren't expending energy, the tip of my nose and my fingers got cold a bit. By the end, we were a little chilly; the ice slowed our pace a lot and the calories from our Rudy's Barbecue breakfast tacos were wearing off too.
Yesterday at minus 9, I was concerned about frostbite on my face and because I started late, I was concerned about the sun going down. So I shortened my time out there.
Today I did about 6.2 miles with my spikes and even though it was about 9 degrees, I was shedding garments for most of the uphill and some of the level. I don't like overheating. None of the days caused problems with the lungs or the like. Picture is top of the climb on Friday.