Mr Morgan confirmed that the scientists from the Bureau’s National Climate Centre concluded that the results and underlying methodology used by NIWA were sound.
NIWA’s seven station temperature series comprises temperature records from Auckland, Wellington, Masterton, Nelson, Hokitika, Lincoln, and Dunedin. The seven locations were chosen because they have robust and well documented temperature records that go back 100 years or more, and they represent a good geographical spread across New Zealand.
Temperature data from the seven locations were first examined 30 years ago by leading New Zealand climatologist, Dr Jim Salinger. After making some adjustments for changes in measurement sites, Dr Salinger concluded that the average New Zealand temperature had warmed significantly during the 20th Century.