Traditional Culture Encyclopedia - Weather inquiry - What kind of experience is it to climb the Great Wall at MINUS 20 degrees?

What kind of experience is it to climb the Great Wall at MINUS 20 degrees?

I feel shivering all over. I feel very tired every step forward. It's MINUS 20 degrees in winter, and every step consumes most of the body's calories. After climbing for less than an hour, I felt very hungry and had to eat helplessly. The Great Wall, which can usually be climbed in an hour, is now three hours away.