On 1 July 2025, NIWA merged with GNS Science to become Earth Sciences New Zealand.

  • (no image provided)

    Mean monthly wet-days

    These datasets are available in a range of formats.
  • (no image provided)

    Map I South

    Education Resource
    The climate of this zone is largely dependent on the lie of the Southern Alps to the west, but many areas are also sheltered by high country to the south and east.
  • Tornado damage Whenuapai.

    Extreme weather - winds and tornadoes

    Education Resource
    Due to its position in the 'Roaring Forties', a belt of strong winds in the Southern Hemisphere which generally occur between the latitudes of 40 and 49 degrees, as well as its small size, New Zealand is a windy country.
  • (no image provided)

    Tuna - maturation and identifying sex

    The sex of tuna is not determined genetically, as in some other organisms.
  • Other vessels

    Facility
    NIWA operates about 30 other Maritime New Zealand-certified vessels based at Bream Bay, Auckland, Hamilton, Rotorua, Turangi, Wellington, Nelson, Greymouth, Tekapo, Christchurch, and Dunedin.
  • (no image provided)

    Nelson-Marlborough

  • Methane

    Facility
    Methane (CH4) is the second most important greenhouse gas after CO2 that is produced by human activities.
  • (no image provided)

    Water temperature and hydro

    How do hydro-electricity activities potentially influence waterway temperatures?
  • (no image provided)

    Summer Series 7: Beware! The golden triangle of the bronze whaler

    News article
  • (no image provided)

    Summer Series 5: Paua is a summer delicacy. Dig deep for the blackfoot sea snail!

    News article
  • (no image provided)

    Soil Moisture Deficit (SMD)

    The 3-panel Soil Moisture Deficit (SMD) map shows the historical soil moisture deficit at the date shown (left), the soil moisture deficit at the same time last year (middle) and the current soil moisture deficit (right).
  • (no image provided)

    Causes of sedimentation

    What are the potential sources of sediments from land use activities?