New Zealand's climate is predominantly temperate maritime (Köppen: Cfb), with mean annual temperatures ranging from  in the south to  in the north. Historical maxima and minima are  in Rangiora, Canterbury and  in Ranfurly, Otago. Conditions vary sharply across regions from extremely wet on the West Coast of the South Island to semi-arid in Central Otago and the Mackenzie Basin of inland Canterbury, and subtropical in Northland. Of the seven largest cities, Christchurch is the driest, receiving on average only  of rain per year and Wellington the wettest, receiving almost twice that amount. Auckland, Wellington and Christchurch all receive a yearly average of more than 2,000 hours of sunshine. The southern and southwestern parts of the South Island have a cooler and cloudier climate, with around 1,400–1,600 hours; the northern and northeastern parts of the South Island are the sunniest areas of the country and receive about 2,400–2,500 hours. The general snow season is early June until early October, though cold snaps can occur outside this season. Snowfall is common in the eastern and southern parts of the South Island and mountain areas across the country.