Maps of average annual rainfall, temperature and other climate variables have been produced for all of New Zealand, based on the period 1981–2010.

When soils erode, sediments are washed into waterways.

Find out more about working at NIWA

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.

NIWA has transformed 1.5 million square kilometres of data into the most accurate and detailed map yet of the land underneath the sea around New Zealand.

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

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

Glass eels (about 5.5 to 7.0 cm) arrive in fresh water during spring, especially during September and October, although they may be present from July to December.

Wood chips and plant material make pulp that is used to produce paper products.

How may agricultural activities increase sediments in waterways?