What happens if I walk in 20 degrees snowing weather from hone to school?

This depends on how far your school is from home but it's possible. Just make sure you dress as warm as you can. I'm talking, a heavy coat, a scarf, ear muffs, gloves and boots etc. You should also keep your mouth covered, it's not a good thing to breath in cold air and make sure you get a good warm meal before you leave.