crandles,
It is hard to tells based on statistics whether there is a pattern or not, but it might be possible that if the increased Antarctic sea ice extent is due to increased wind, then there may be more rafting of the sea ice resulting in thicker ice which then might not start to break-up until after the period of peak austral sunlight (in December).
In any event, you can see from the attached image that almost all of the Antarctic sea ice anomaly today is located in the Weddell Sea Area while the sea ice offshore of both the Amundsen and Ross Sea (on the Pacific Coast) is breaking-up now, which will soon expose the grounded ice to more storm and wave action.