Yes, I learned decades back, when it gets below -20 , it gets noticilby colder with each new -5 dgrees.
At still air temps. of -15 daylight, my long johns come out of the drawer.
Been in -50 but you had to go NOrth of here plus or minus 100 miles , of here, back then, to get the extreme dangerous; no car blockheater, no go any where, weather.