NZ temperature graph doesn’t meet proper standards

Parliament Buildings through an onion

We’re working through several answers from the Hon Wayne Mapp, Minister of Research, Science and Technology, concerning questions posed by ACT about the National Institute of Water and Atmospheric Research (NIWA).


The last of the questions posed by John Boscawen on behalf of ACT on February 19 asked about the official graph of the seven-station temperature series which shows warming over New Zealand during the 20th Century.

The answer, on March 1, said the iconic graph was finally justified by work done over about six weeks, from mid-December to early February. I’m sorry, that’s wrong: the graph was not justified by this work; the graph remains unjustified except for the portion related to Hokitika — that’s right, yes, I’ve got it now.

The work NIWA did justified only the temperature history at Hokitika, although it hasn’t been peer-reviewed yet by independent scientists, only by colleagues at NIWA, so there might still be errors in it.

You wouldn’t get away with it at high school

So the temperature graph made from seven weather stations, which NIWA has used for years to prove that the New Zealand climate has warmed, and thus we must take expensive action against global warming caused by humanity’s emissions of carbon dioxide, has never had proper scientific standing. Continue Reading →