<P> Northern cities such as Auckland, Whangarei, and Tauranga experience mean yearly maxima of between 19--20 ° C (66--68 ° F) and mean yearly minima of around 11--12 ° C (52--54 ° F). Eastern cities on the North Island such as Gisborne, Napier, and Hastings also have mean yearly maxima of between 19--20 ° C (66--68 ° F) but have slightly lower yearly mean minima of around 9--10 ° C (48--50 ° F). The two largest cities on the South Island, Christchurch and Dunedin, have mean yearly maxima of 17.3 ° C (63.1 ° F) and 14.6 ° C (58.3 ° F) and yearly mean minima of 7.3 ° C (45.1 ° F) and 7.6 ° C (45.7 ° F) respectively . </P> <P> Daily maximum temperatures are normally in the mid to low 20s (° C) over most of the country . They are higher in northern, eastern and interior part of the country; Hastings is the warmest city on average with 25.5 ° C followed by Gisborne with 24.9 ° C and Napier with 24.5 ° C. Eastern parts of the South Island are highly susceptible to the norwester, a Fohn wind which can result in temperatures going into the high 30s and even the low 40s . Rangiora in Canterbury holds the record maximum of 42.4 ° C recorded in 1973, with Christchurch recording 41.6 ° C in that same year . More recently, Timaru reached 41.3 ° C on Waitangi Day in 2011 . Due to these winds, the cooler southern cities of Dunedin and Invercargill have higher all - time record temperatures than places further north such as Wellington, Auckland and Whangarei . </P> <P> Winter temperatures are much milder in New Zealand compared to other areas of similar latitude, with the exception of the Central Otago and Mackenzie Basin regions mentioned above . Maxima are generally 10--15 ° C (50--59 ° F) in the North Island, decreasing as one goes further south or inland . The South Island is a bit cooler, with maximum temperatures around 7--12 ° C (45--54 ° F), though sometimes lower . Eastern areas are generally cooler than the west . 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 . </P> <P> July 1863 The blizzard and flood of 1863 was a series of consecutive natural disasters in Central Otago in New Zealand's South Island . From July to August 1863 the Otago gold fields suffered from a combination of floods, snowstorms, and blizzards that caused heavy loss of life among the gold miners . At least 40 died during the July rains and more than 11 in the August snows . Sources using the earliest reports of loss of life tend to greatly overstate the numbers who died . </P>

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