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absolute humidity altitude appears areas astronomical darkness auroral autumn and winter average Bateson BB MJ BB Black Birch BLACK BIRCH MOUNT Blenheim Central Otago Christchurch cirrus cloud cover considered Coronet Peak district diurnal dust effect estimates feet figures GRAND MEANS ground cover haze horizontal visibility image motion image quality inch JET STREAMS JULY JUNE knots Lake Tekapo latitudes layer Mackenzie Basin Manorburn Marlborough maximum MJ BB MJ months Mount John Mount Malita Nelson City normal observations Observatory Old Man Range overcast percentages period photometric possible precipitation rain raindays rainfall records relative humidity road RODING RIVER seasons Section skies smoke snow South Island spring and summer stars station summit survey Table testing throughout the night Timaru usuable nights visual Wairau Plains Wellington whilst wind directions WINTER SPRING Zealand