This animation from a computer model shows the variations of sea-surface temperatures around New Zealand over a one-year period. Red and orange indicate warm water (about 18–21ºC) flowing south from the tropical Pacific. Blue indicates cold water (8–11ºC) flowing north-east from the Southern Ocean. It is no surprise that swimming is more common at Auckland’s beaches than Otago’s.
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NIWA – National Institute of Water and Atmospheric Research
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