Why is it better to breathe through the nose in the cold?

The nasal cavity exhibits a unique ability to raise or lower the temperature of inhaled air. When it is -25 C outside, the air in a person's nasal cavity heats up to +35... +36,6 С.

As opposed to the oral cavity, the nasal one heats the air much more effectively. It is like a built-in split system that ensures normal functioning of the lower respiratory tract.