Antarctic Runway Closed Due to Heat

I found this article about an Antarctic runway being closed interesting because most of the time I end up reading about runways and airplanes turning back from the Antarctic because of cold temperatures. This season, though, the Wilkins Runway at Australia's Casey Station has been closed due to warm temperatures. The runway is made out of ice, so the warm temperatures make it structurally unstable. Global Warming or climate change perhaps, but perhaps just an unusually warm summer in the Antarctic or at least in the region where Casey Station is located.