To be prepared is half the victory.

'Now the weather was continually changing. Within minutes one was alternately freezing or roasting in the sunshine. Hailstones, rain and sunshine followed each other in quick succession - one morning we awoke to find our tent buried in snow, which in a few hours mekted in the hot sunshine.Our European clothes were unsuited to these continual changes of temperature and we envied the Tibetans their practical sheep skin cloaks, belted at the wast and with long wide sleeves to take the place of gloves.'  (from, Seven Years in Tibet, by Heinrich Harrer)