It is colder there because of the sun angle. The sun must travel through more atmophere and there is greater reflection and less water vapor to hold in heat. Also there are fewer daylight hours during the winter.
The North Pole has ice because it is consistently at temperatures below the freezing point, meaning that the Pole’s ocean water freezes into ice. This creates sea ice that is usually between two and three meters in thickness.
The South Pole, by contrast, is on a landmass – the continent of Antarctica. Like the North Pole, however, it is also always at extremely low temperatures, resulting in the buildup of ice and snow on the South Pole’s surface.
Additional source: http://en.wikipedia.org/wiki/South_Pole#Climate
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