Spit-crackling cold!
https://americanenglish.state.gov/files/ae/resource_files/to-build-a-fire.pdf
“As he turned to go, he forced some water from his mouth as an experiment. There was a sudden noise that surprised him. He tried it again. And again, in the air, before they could fall to the snow, the drops of water became ice that broke with a noise. He knew that at 50 below zero water from the mouth made a noise when it hit the snow.
But this had done that in the air. Undoubtedly it was colder than 50 below. But exactly how much colder he did not know. But the temperature did not matter.”