July Climate Summary - Mild Month Overall

New Zealand Climate Summary: July 2016 Issued: 3 August 2016

A mild month overall and dry for eastern areas of the country.

Overview

During July 2016, mean sea-level pressures were lower than normal over and to the south of New Zealand. This pressure pattern resulted in a prevalence of winds from a westerly direction. July temperatures were above average (+0.51°C to +1.20°C above the July average) in many parts of the country. It was a particularly warm month for Central Otago, the Southern Lakes, the Mackenzie Basin, Kaikoura and Auckland which recorded well above average temperatures (>1.20°C above the July average). Eastern parts of the lower South Island, the West Coast and the Central Plateau observed near average July temperatures (-0.51°C to +0.50°C of the July average). The nationwide average temperature in July 2016 was 8.6°C (0.7°C above the 1981-2010 July average from NIWA’s seven station temperature series which begins in 1909), making July 2016 the 10th-warmest July on record using this series. The first seven months of 2016 have all been warmer than normal, and January-July 2016 is the warmest January-July period in the seven station temperature record with a departure from average of +1.3°C.

The prevalence of winds from a westerly direction was clearly reflected in the rainfall totals observed throughout the country. Eastern areas of both the North Island and South Island were in the rain shadow of these prevailing winds and very dry as a result, with well below normal rainfall (<50% of the July normal) observed in parts of Gisborne, Hawke’s Bay, coastal Wairarapa and eastern Canterbury. In contrast, it was a wet month for areas more exposed to the westerly winds, including southern, western and inland parts of the South Island, Whanganui and the Central Plateau, where rainfall was typically well above normal (>149% of the July normal) or above normal (120-149% of the July normal). It was a particularly wet month for inland parts of Southland and Otago, Mount Cook Village, Milford Sound, Reefton and Westport which recorded more than double their normal July rainfall respectively. Rainfall was near normal (80-119% of the July normal) for most of Northland, Auckland, the Bay of Plenty and Taranaki.

As at 1 August 2016, soil moisture levels were below normal for the time of year for eastern parts of Canterbury and Marlborough north of Ashburton, coastal Wairarapa and Hawke’s Bay. Soil moisture levels were mostly near normal for remaining parts of New Zealand.

July sunshine was well above normal (>125% of the July normal) in Paraparaumu, Wellington, eastern Canterbury, Central Otago, the Southern Lakes and south Otago, and above normal (110-125% of the July normal) for most remaining areas of New Zealand. The exceptions were areas of Northland, Auckland, the Central Plateau and the West Coast where July sunshine was near normal (90-109% of the July normal).

Further Highlights:

• The highest temperature was 22.3°C, observed at Christchurch (Riccarton) on 23 July.

• The lowest temperature was -8.7°C, observed at Hanmer Forest on 12 July.

• The highest 1-day rainfall was 225 mm, recorded at North Egmont on 13 July.

• The highest wind gust was 195 km/hr, observed at Cape Turnagain on 24 July.

• Of the six main centres in July 2016, Christchurch was the coolest, driest and sunniest, Auckland was the warmest, Tauranga was the wettest, and Dunedin was the cloudiest.

• Of the available, regularly reporting sunshine observation sites, the sunniest four locations in 2016 so far (1 January – 31 July) were Richmond (1636 hours), Blenheim (1515 hours), New Plymouth (1451 hours) and Takaka (1444 hours).

Climate_Summary_July_2016.pdf
NZweatherrecordsJULY2016web.pdf

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