How much daylight is there in Antarctica during summer and winter?
On Antarctica’s coast, where our stations are located, there are usually a couple of weeks in mid-winter (around 21 June) when the sun does not rise, and a couple of weeks in summer around Christmas when there is 24-hour sunlight.
The polar circles (both the Antarctic Circle at 66°33' S and Arctic Circle at 66°33' N) mark the latitude beyond which the sun remains completely below the horizon throughout the day on Midwinter’s Day and completely above the horizon on Midsummer’s Day. As you move closer to the poles, the periods of winter darkness and summer daylight increase.
Compare the graphs below for Mawson and Davis. Davis is located further south than Mawson and therefore the sun does not rise here for a longer period of time during winter. At the poles themselves, the seasonal changes are even more pronounced: 24 hours of daylight occur for several months over summer, while there is complete darkness for several months during winter.
The diagrams below show how the length of day changes as you travel south to north from South Pole to Davis, Mawson, Casey, Macquarie Island and Kingston, Tasmania.
