Being narrow, mountainous islands lying in the path of the prevailing wind, New Zealand is subject to high rainfall and high humidity.
Compared to much of the world where 70% humidity is considered to be the threshold of corrosion and health problems, New Zealand has very high humidity, particularly around the northern regions, where the relative humidity is often more than 90%.
Temperature variations, on the other hand, are quite low; nearly all the inhabited areas of NZ being in what is defined as a Temperate environment.
The design requirements to deal with this environment are specific to NZ’s climate and building practices. It is not advisable to use design or installation practices from countries with different environmental conditions, without comprehensive assessment.