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Story: Floods

New Zealand mean annual rainfall, 1991–2020

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A map of New Zealand using colour to show mean average rain fall.

This map shows the mean annual rainfall around New Zealand, measured over a 30-year period. The South Island has both the wettest and the driest parts of the country within 100 kilometres. Highest rainfall occurs along a narrow zone over the Southern Alps, as well over mountains in north-west Nelson and scattered mountainous areas in the North Island.

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NIWA – National Institute of Water and Atmospheric Research

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How to cite this page

Eileen McSaveney, Floods – New Zealand’s number one hazard, Te Ara – the Encyclopedia of New Zealand, https://teara.govt.nz/en/map/4873/new-zealand-mean-annual-rainfall-1991-2020 (accessed 24 June 2026).

Story by Eileen McSaveney, published 2 March 2009, updated 1 February 2024.