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Author Topic: NZ weather summary September 1970  (Read 1941 times)

Offline Rwood

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NZ weather summary September 1970
« on: March 13, 2012, 09:17:26 PM »
September 1970:  September was marked by an unusually high frequency of northwesterly winds. It was the wettest September over the country as a whole since 1943 and also stormy and cloudy. A particularly cold southerly change on the 24th brought snow to many inland districts of the South Island, with considerable lamb losses. Severe frosts which followed in the south on the 25th-26th proved disastrous for the Central Otago fruit crop. Unusually strong northwesterly gales buffeted Central Otago and the Canterbury high country on the 10th, reaching an average wind speed over 10 minutes at Mount John Observatory of 134 mph. Strong northwesterly gales also buffeted Wellington and Hawkes Bay on the 24th. Small local tornadoes were reported in Mangere on the 11th and in New Plymouth on the 17th.

Rainfall: Rainfall was above normal over nearly the whole country. It was more than double the normal value over the greater part of the South Island, in an area extending eastward from Nelson and the West Coast, including the Marlborough Sounds, the high country, and Central Otago. In parts of the Southern Lakes district it was more than 4 times the average. In the North Island it was more than double the normal from Waitomo and Taranaki to eastern Bay of Plenty, and also in Manawatu. Flooding was reported on the West Coast, and in North Otago, after considerable rain from the 14th to the 17th. The 29th-30th brought falls of 3”-4” in Bay of Plenty, Taupo and Waikato, causing flooding around Whakatane and later in the Waipa and lower Waikato rivers.

309mm rainfall at Kawerau, 275mm at Taumarunui, 1360mm at Stratford Mountain House, 1177mm at Franz Josef, 226mm at Tekapo (highest); 45mm at Christchurch.

Temperatures:  Temperatures were warmer than normal by 1F-3F over the North Island and in most of Marlborough and Canterbury. They were cooler than normal by 1F-2F in Otago, Southland and Fiordland. At Mid Dome, in western Southland, the temperature dropped to 11.2F (-11.6C) on the 25th, the lowest ever recorded in September in New Zealand below an altitude of about 3000’. On the following day the minimum was still only 13F.

Sunshine:  Sunshine was below average over the whole country [close to average in Motueka, Wellington and Kapiti], mainly by 30-60 hours. Deficits were particularly large in Bay of Plenty.

[Some totals:  Kaitaia 127, Kerikeri 117, Whangarei 112, Leigh 117, Auckland 121, Tauranga 117, Whakatane 124, Taupo 105, Opotiki 115, Auckland Aero 130, Hamilton 107, New Plymouth 126, Masterton 138, Gisborne 146, Napier 150, Wairoa 148, Paraparaumu 155, Ohakea 145, Kairanga 146, Palmerston North 122, Levin 130, Wellington 156, Stratford 126, Ohakune 109, Wanganui 143, Takaka 157, Westport 101, Hokitika 112, Greymouth 86, Haast 120, Riwaka 183, Nelson 168, Blenheim 159, Grassmere 152, Kaikoura 133, Mt Cook 82, Mt John 161, Methven 129, Christchurch 125, Tekapo 157, Timaru 138, Waimate 124, Omarama 148, Palmerston 101, Dunedin Aero 125, Dunedin 108, Oamaru 110, Queenstown 137, Alexandra 159, Invercargill 119, Raoul Is 111 {2nd lowest}, Campbell Is 57, Chatham Is 121]

Sources: NZ Met. Misc. pub. 107 (Climatological table, NZ Gazette) and NZ Met. Misc. pub. 109 (Meteorological Observations).

« Last Edit: November 12, 2018, 10:42:54 AM by Rwood »



Offline Rwood

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Re: NZ weather summary September 1970
« Reply #1 on: November 12, 2018, 10:41:23 AM »
Some notable readings for rainfall, minimum temperatures and wind speeds.

I was in Alexandra when the snow event happened. We have a photo of a (then) infant daughter sitting on a tray placed on the remnants of the snow on my parents' holiday property - looking as if she's sitting in the snow. A return trip though the lakes in brilliant sunshine was spectacular scenic compensation for the earlier weather.


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