As discussed in a November post, there are probably only a few days each winter during which the 700 mb (roughly 10,000 feet) reaches -20C or colder.
Today was one of those days. The 700 mb temperature in this morning's sounding from the Salt Lake Airport was -21.1C, or -6.0F.
With a low sun angle, it felt really cold out today, and it was. I somehow survived a 6-hour ski tour, but only by moving almost continuously and stopping only very briefly to eat or drink. As an example of how cold it was, the Solitude-Apex observing site at 9061 ft recorded an afternoon maximum temperature of -1.5F.
Snow conditions were, however, unbelievable. Bottomless cold smoke. To the sufferers go the spoils.