<P> Lake Rotoroa (Hamilton Lake) began forming about 20,000 years ago . Originally it was part of an ancient river system that was cut off by deposition material and became two small lakes divided by a narrow peninsula . With higher rainfall and drainage from the extensive peat land to the west, the water level rose so the narrow peninsula was drowned so forming one larger lake . To the north the lake is 8m deep and in the southern (hospital) end 6m deep . The old dividing peninsula, the start of which is still visible above water on the eastern side, is only 2m below the surface . </P> <P> Hamilton is one of the few cities in the world that has a near - exact antipodal city--Córdoba, Spain . </P> <P> Hamilton's climate is oceanic (Köppen: Cfb), with highly moderated temperatures due to New Zealand's location surrounded by ocean . Despite this, as the largest inland city in the country winter mornings can be cold by New Zealand standards (the lowest of the North Island's main centres), dropping as low as − 4 ° C (25 ° F) several times per year . Likewise summers can be some of the hottest in the country with temperatures rising as high as 29 ° C, on an annual basis . Hamilton also features very high humidity (similar to tropical climates such as Singapore) which can make temperatures feel uncomfortably warm or cold . Ground frosts are common and snow is possible but rare . The only recorded snowfall in modern times was light snowflakes in mid August 2011 during a prolonged cold period that saw snowfall as far north as Dargaville . </P> <P> Hamilton receives considerable precipitation amounting to around 1,100 mm over 125 days per year . This coupled with average sunshine hours of around 2000 makes Hamilton and the surrounding Waikato an extremely fertile region . </P>

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