Weather comparison

When I first arrived here, I was surprised because there was a snowfall. I had not seen this before when I was in Korea. In Korea, there is snow sometimes, but not such like here. Here it is much colder than Korea. Sometimes I cannot even breathe, because it is too cold. And something is strange here, because some days it is really warm, but the next day it is very cold. I cannot understand how weather can change suddenly. Another thing is sometimes it was snowing, but a few hours later it was raining. And then finally it was icing. I think Korean weather is better than that of the U.S.A.