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Following lighter rain on 30 and 31 January, areas of Auckland flooded for a second time on the morning of 1 February after more heavy downpours. [10] MetService reported that about 20–30 millimetres per hour (0.79–1.18 inches per hour) of "intensive rainfall" had fallen in parts of Auckland in the early hours of 1 February. [29]
NIWA and MetService are both government organizations that produce weather forecasts. NIWA was previously part of the MetService until 1992. NIWA was previously part of the MetService until 1992. [ 5 ] [ 6 ] In 2009, they signed a memorandum of understanding to work more closely together. [ 34 ]
The current forecast for global sea level rise is for 0.5 m by 2100, but in some parts of New Zealand, the effective rise in sea level could be twice as great by that time, because of the combined effect of gradual land subsidence. [7] Many different parts of the country are affected by the change in forecast sea level rise.
The South Island is a bit cooler, with maximum temperatures around 7–12 °C (45–54 °F), though sometimes lower. The lowest temperature ever recorded was −25.6 °C (−14.1 °F) at Ranfurly in Otago in 1903, with a more recent temperature of −21.6 °C (−6.9 °F) recorded in 1995 in nearby Ophir. [7]
Over 180,000 km (110,000 mi) of rivers has been mapped in New Zealand, [4] the longest being the Waikato River with a length of 425 kilometres and the largest river by volume is the Clutha River with a mean discharge of 614 cubic metres per second.
Average sea temperature around Auckland varies throughout the year. The water temperature is warmest in February when it averages 21 °C (70 °F), while in August, the water temperature is at its coolest, averaging 14 °C (57 °F). [54] Prevailing winds in Auckland are predominantly from the southwest.
The ocean temperature plays a crucial role in the global climate system, ocean currents and for marine habitats. It varies depending on depth, geographical location and season. Not only does the temperature differ in seawater, so does the salinity. Warm surface water is generally saltier than the cooler deep or polar waters. [1]
Temperatures are taken from seven climate stations throughout the country and combined into an average. According to NIWA, the National Institute of Water and Atmospheric Research, 2022 was Aotearoa New Zealand’s warmest year on record. The nationwide average temperature for 2022 was +1.15 ˚C above the 1981–2010 annual average.
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