The climate of this area is greatly dependent on its exposure to weather systems from the Tasman Sea and the lie of the Southern Alps to the east.

A monthly summary of the climate in the tropical South Pacific islands, with an outlook for the coming months.

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.

Information about climate and weather and links to climate-related websites.

Submerged plants have a number of advantages that favour their use as indicators of lake ecological condition.

NIWA collects a vast range of environmental information about New Zealand’s environment from the sky to the seafloor.

A regional climatology is a summary of the typical weather and climate of a region, based on historical data observations made at climate stations located within the region.

NIWA maintains the national climate database for New Zealand, and can supply data in a variety of ways.

Northland, with its northern location, low elevation and close proximity to the sea is characterised by a mild, humid, and rather windy climate.

The Intergovernmental Panel on Climate Change (IPCC) is charged with assessing the most up to date scientific, technical and socio-economic research on climate change.