It's so astonishing how the climate is affected by wind and chain of mountains. Have u ever heard of the Nor'wester? It's a dry, hot wind that has impact on Canterbury and especially Christchurch (People get grumpy and depressed). The wind comes from the Tasman Sea in the West and has a humidity of almost 100%! (MISSING)When coming across the Southern Alps, the wind condenses and results in rainfalls. Afterwards there remains only 15 %!o(MISSING)f humidity which is the actual Nor'Wester. The Arthur's Pass is a good place to study how weather works. It is a barrier between the West and East Coast and causes huge weather differences. I was lucky to see them. On the Westside you have got beautiful, sunny sky, whereas the East Coast is covered by clouds. The clouds are caught between the mountain ridge and resolves in air on the other side.