December is typically marked by sunshine and blue skies with increasing hours of daylight. Temperatures are reaching their warmest, as the height of the summer sets in. Glaciers calve, whales return from the tropics, and research activity increases. However, this is Antarctica and the odd whiteout can still occur. You'll want to bring warm clothing and base layers, with the following average daily temperatures:
These regions experience the mildest climate in Antarctica, further inland and at higher elevations, the weather is far more extreme.