The conditions did not get that cold but if you were not moving or did not have good boots, you would freeze.
Some other people on the tour stayed near the vehicle, thinking they had warmth being able to get out of the wind. These people froze and had a miserable time.
I went in search of better foregrounds and was walking through waist deep snow up and down embankments so I was toasty warm, sweating in some spots (sweat later froze on my face).
Also, the difference in photo quality was obviously much greater so all the trudging through snow was worth it.
Here is a link
to the weather I had. Temperature not that low for Alaska standards but the windchill on some nights made it feel much colder.