Visiting the park is recommended between late December and late February, during the southern summer. Not only is the weather more hospitable, but daylight hours are very long given the extreme southern latitude. Outside of this time frame, the weather becomes too extreme for the majority of the public, and daylight dwindles to only a few hours a day.
BEAutiful park, drive was nice, lots of places to get out and explore along the scenic drive. Many options and able to tailor to your time and abilities.