Atmospheric analysis

The Standardised Precipitation Index (SPI) is a simple measure of drought (and also of very wet conditions) and is based solely on the accumulated precipitation for a given time period.

Find out more about our water quality tools.

View data that show reported target catch and estimated bycatch.

A versatile inshore vessel, RV Ikatere is equipped with high-precision multibeam and sub-bottom profiler transducers for surveying and mapping the seabed.

One of the major consequences of climate change is rising global sea levels.

Stormwater is a major concern for New Zealand because of its potential effects on the ecological health of our urban streams and coastal waters, as well as on the economic, social and cultural value of these environments.

Seasonal climate summaries from summer 2001 to the present.

Digital copies of all our annual reports published since 2011.

NIWA's High Intensity Rainfall Design System (HIRDS) offers planners and engineers more certainty about the frequency of high-intensity rainfall events, enabling them to better design stormwater drainage, flood defence systems and other vital structures.

Links to related resources and websites

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Virtual climate station estimates are produced every day, based on the spatial interpolation of actual data observations made at climate stations located around the country.