Winter temperatures at the North Pole can range from as low as −43 °C (−45 °F) to −26 °C (−15 °F). Summer temperatures, on the other hand, average around the freezing point, otherwise known as 0 °C (32 °F). Temperatures at the South Pole are considerably lower than at the North Pole, primarily due to the fact that the South Pole is located at an altitude in the middle of a continental land mass, while the North Pole is at sea level in the middle of an ocean, which acts as a reservoir of heat. In midsummer, high temperatures at the South Pole average at around −25.9 °C (−15 °F). Temperatures drop as the sun gets lower, as low as −45 °C (−49 °F). In winter, the average temperature remains steady at around −58 °C (−72 °F).