How many degrees is it from the north pole to the south pole?

The North Pole is at 90 degrees N latitude, the South Pole is at 90 degrees S latitude. All lines of longitude converge at both the North and South Poles.

The south pole is defined as 90 degrees south latitude. I guess you might call that "-90 degrees north".

There are 180°s from the North Pole to the South Pole.

180 degrees. A complete circle is 360 degrees, and the North Pole and South Pole are a half-circle away from each other.

very cold