Rainfall and temperature tercile tables for several locations in the West and South of the South Island. Data are based on the 30-year period 1971-2000. The ranges for each tercile are: below normal = ...

The Global Warming Potential (GWP) of a greenhouse gas is its ability to trap extra heat in the atmosphere over time relative to carbon dioxide (CO 2). This is most often calculated over 100 years, ...

New Zealand's climate is complex and varies from warm subtropical in the far north to cool temperate climates in the far south, with severe alpine conditions in the mountainous areas. Mountain chains ...

View annual, seasonal and monthly summaries of temperature, rainfall and sunshine data from across New Zealand. You might also be interested in our 'Seven-station' series temperature data. This ...

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 ...

Greenhouse gases are atmospheric gases that intercept long-wave (mainly infrared) radiation emitted from the Earth's surface. By intercepting infrared radiation and re-radiating it in all directions ...

Researchers in New Zealand, and around the world, are beginning to understand the different ways our communities will be impacted by climate change. Some of the impacts are already clear, for example, ...

The drought forecasting tool uses innovative climate modelling, the latest in machine learning and other data-driven techniques to predict rainfall 35 days ahead. Helping farmers and growers better ...

Earth Sciences New Zealand | NIWA We provide applied science and environmental consultancy services to support international development. NIWA works collaboratively with Pacific partners to support ...

NIWA has working relationships with hundreds of organisations in New Zealand and overseas. Most of NIWA’s revenue is from contestable research funding and commercial consultancy work. The remaining 14 ...

Aotearoa New Zealand’s marine biodiversity checklist has been updated, representing an increase of 3,630 known living species since the turn of the century. The Marine Biota of Aotearoa New Zealand ...

The graph shows carbon dioxide (CO 2) levels measured at Baring Head, NIWA’s clean air station, near Wellington. This station has been running since 1972 and is home to the longest running continuous ...