Author Topic: NZ weather summary August 1970  (Read 1294 times)

Offline Rwood

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NZ weather summary August 1970
« on: March 13, 2012, 09:12:39 PM »
August 1970: August was marked by an unusually high frequency of northerly to easterly winds. It was cloudy, mild, and wet with some major floods. Growth was good in most districts.

Rainfall: Rainfall was more than double the normal value in Auckland City and Coromandel; in Bay of Plenty and Taupo; about and east of Nelson City; and in the Alps and Canterbury high country together with Central Otago. Most of the remainder of the country also received rainfall somewhat above normal. However, rainfall was 25% below normal in most eastern districts from Rangiora to Balclutha. Widespread flooding of the Rangitaiki Plains and other parts of eastern Bay of Plenty occurred following heavy rain there on the 13th as a depression developed in a trough during the passage over the area. Many daily rainfalls were reported of 5”-10”. A trough of low pressure became stationary over Nelson on the 29th, and heavy rain caused slips and serious flooding in the city. The daily fall of 5.41” was the highest there in over 80 years of observation, with 4” of this between 6pm and midnight. On the following day the same trough caused daily falls of up to 12” in the Alps, with major floods in the Buller and Grey Rivers.

Some totals: 523mm at Te Teko, 263mm at Ardmore, 1203mm at Stratford Mountain House, 660mm at Mt Cook. 11mm at Berwick Forest, near Dunedin.

Temperatures: Temperatures were above normal, mainly by 1F-3F in the North Island, by 2F-4F over the South Island; and by a littler over 2F over the country as a whole. Mt Cook had its warmest August in over 40 years of record. The winter has been persistently mild. In parts of the South Island it has been the mildest winter in many years of record. Thus Naseby and Mt Cook have had their highest winter mean temperature in over 40 years of record; and Christchurch had its highest mean in over 60 years of record, equal with 1916 and 1962. The main period of cold southerlies was from the 22nd to the 24th, when a few stations in the South Island high country reported snow falls.

23.4C
maximum at Kaikoura on the 28th, -7.6C minimum at Rotoiti on the 26th.

Sunshine:  Sunshine was below normal over nearly the whole country. In Bay of Plenty and eastern and southern districts of the North Island the deficiency was 40-60 hours.

[Some totals:  Kaitaia 143, Kerikeri 143, Whangarei 144, Leigh 168, Auckland 155, Tauranga 113, Whakatane 119, Taupo 100, Opotiki 108, Auckland Aero 155, Hamilton 104, New Plymouth 137, Masterton 92, Gisborne 131, Napier 111, Wairoa 111, Paraparaumu 99, Ohakea 117, Kairanga 114, Palmerston North 109, Levin n/a, Wellington 96, Stratford 97, Ohakune 107, Wanganui 106, Takaka 140, Westport 112, Hokitika 123, Greymouth 118, Haast 111, Riwaka 147, Nelson 150, Blenheim 149, Grassmere 149, Kaikoura 155, Mt Cook 87, Mt John 143, Methven 127, Christchurch 132, Tekapo 132, Timaru 136, Waimate 140, Omarama 119, Palmerston 122, Dunedin Aero 121, Dunedin 122, Oamaru 139, Queenstown 96, Alexandra 138, Invercargill 147, Campbell Is 28, Chatham Is 66]

Sources: NZ Met. Misc. pub. 107 (Climatological table, NZ Gazette) and NZ Met. Misc. pub. 109 (Meteorological Observations).
« Last Edit: November 04, 2018, 07:29:37 PM by Rwood »



Offline Rwood

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Re: NZ weather summary August 1970
« Reply #1 on: November 04, 2018, 07:30:25 PM »
Another mild winter month, but far too wet in many places.


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