Weather and altitude
The experienced leader prepares the party for altitude-induced changes in weather. In normal conditions, the ambient air temperature will decrease at about 1°C for every 100 m climbed. Warmer clothing will be required at the top.
As well, the thickness of air above decreases, and the protection it offers from sunburn decreases. Additional sunscreen may be required. The relative lack of oxygen could cause problems for the less fit members of the party, although this is unusual at Australian altitudes.
In alpine areas, the wise leader may ask party members to put on additional clothes prior to leaving the protection of snow gums for the open alpine slopes, particularly in cold, windy conditions. The additional windchill in the open can be substantial, particularly if clothes are damp from mist or perspiration.