New Zealand's climate is complex and varies from warm subtropical in the far north to cool temperate climates in the far south, with severe alpine conditions in the mountainous areas.
Mountain chains extending the length of New Zealand provide a barrier for the prevailing westerly winds, dividing the country into dramatically different climate regions. The West Coast of the South Island is the wettest area of New Zealand, whereas the area to the east of the mountains, just over 100 km away, is the driest.
Most areas of New Zealand have between 600 and 1600 mm of rainfall, spread throughout the year with a dry period during the summer. Over the northern and central areas of New Zealand more rainfall falls in winter than in summer, whereas for much of the southern part of New Zealand, winter is the season of least rainfall.
Mean annual temperatures range from 10°C in the south to 16°C in the north of New Zealand. The coldest month is usually July and the warmest month is usually January or February. In New Zealand generally there are relatively small variations between summer and winter temperatures, although inland and to the east of the ranges the variation is greater (up to 14°C). Temperatures also drop about 0.7°C for every 100 m of altitude.
Most places in New Zealand receive over 2,000 hours of sunshine a year, with the sunniest areas—Bay of Plenty, Hawke's Bay, Nelson and Marlborough—receiving over 2,350 hours.As New Zealand observes daylight saving, during summer months daylight can last up until 9.00 pm. The midday summer solar radiation index (UVI) is often very high in most places and can be extreme in northern New Zealand and in mountainous areas. Autumn and spring UVI values can be high in most areas.
Most snow in New Zealand falls in the mountain areas. Snow rarely falls in the coastal areas of the North Island and west of the South Island, although the east and south of the South Island may experience some snow in winter. Frosts can occur anywhere in New Zealand and usually form on cold nights with clear skies and little wind.
New Zealand Seasons
Spring - September, October, November
Summer - December, January, February
Autumn - March, April, May
Winter - June, July, August
New Zealand Summer
New Zealand's summer months are December to February, bringing high temperatures and sunshine. Days are long and sunny, nights are mild. Summer is an excellent time for walking in the bush and a variety of other outdoor activities. New Zealand's many gorgeous beaches are ideal for swimming, sunbathing, surfing, boating, and water sports during summer.
New Zealand Autumn
March to May are New Zealand's autumn months. While temperatures are a little cooler than summer, the weather can be excellent, and it is possible to swim in some places until April.
While New Zealand's native flora is evergreen, there are many introduced deciduous trees. Colourful changing leaves make autumn a scenic delight, especially in regions such as Central Otago and Hawke's Bay, which are known for their autumn splendour.
New Zealand Winter
New Zealand's winter months of June to August bring colder weather to much of the country, and more rain to most areas in the North Island. Mountain ranges in both islands become snow-covered, providing beautiful vistas and excellent skiing.
While the South Island has cooler winter temperatures, some areas of the island experience little rainfall in winter, so this is an excellent time to visit glaciers, mountains, and other areas of scenic beauty.
New Zealand Spring
Spring lasts from September to November, and New Zealand's spring weather can range from cold and frosty to warm and hot. During spring buds, blossoms, and other new growth bursts forth throughout the country and new born lambs frolic in the fields just before dusk.
Both Alexandra in Central Otago and Hastings in Hawke's Bay celebrate spring with a blossom festival. If you're into white water rafting, this is the time when melting spring snow makes river water levels excitingly high!
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