Author Topic: New Zealand Weather Summary for 1951  (Read 6059 times)

Offline Sheldybett

  • Full Member
  • ***
  • Posts: 113
  • Country: nz
  • Karma: 29
  • Gender: Male
New Zealand Weather Summary for 1951
« on: May 22, 2019, 08:42:13 PM »
A Brief Review of 1951.

Rainfall was much above average in eastern districts from Canterbury to Gisborne, also about Nelson, Marlborough, and in the far north. Canterbury established a new record for wetness, many parts of the province having received more than the average annual rainfall in the first half of the year. In and near Christchurch the year's rainfall had not been exceeded in over ninety years of recordings. For the remainder of the country rainfall was close to the average, except in south Westland and in parts of Southland and Taranaki where there was a small but appreciable deficiency.

Mainly resulting from the wet cold weather of late autumn and winter, both the duration of sunshine and the mean temperature for the year were appreciably below average east of the main ranges. Temperatures elsewhere were about normal, but sunshine was deficient over the whole of the North Island. From Masterton to Gisborne the deficiency was at least 200 hours, while Napier's total of 2075 hours was 330 hours below the average, and the lowest since records commenced in 1907.

Seasonal Notes.—The year started with a period of mild, settled weather, but conditions deteriorated towards the end of January, when gales caused the loss of some crops of small seeds. Temperatures on the whole were above normal throughout the summer and early autumn, but conditions generally were rather unsettled, especially in eastern districts, where the rainfall was persistently high. In Canterbury it was a particularly wet period, and much trouble was experienced in harvesting cereal crops and preparing the ground for autumn sowings. Sheepfarmers also had their troubles, but it was an excellent season for the dairying industry.

Rain fell profusely in April and extensive flooding occurred about the middle of the month in Canterbury, where the weather remained unsettled through the succeeding month. May was also wet in the Gisborne district, but elsewhere it was mainly sunny though rather cold.

In June the weather was more settled, but temperatures were very cold, with many severe frosts. In Canterbury it was the coldest June for over forty years, but, fortunately, snowfalls were light and were confined to the high country. Unsettled weather predominated for the remainder of the winter season, with August temperatures below even those of July. A heavy fall of snow down to low levels towards the middle of August caused many deaths among new-born lambs in the North Island.

September was remarkable for its record low rainfall. By contrast, the remainder of the spring season was characterized by a persistence of dull stormy weather. Although spring growth got away to an excellent start the season became progressively more backward. Conditions were not at all favourable for early vegetables, the North Island potato crop being particularly poor. However, in spite of frequent and often heavy rain, there was no major flooding. It was not a good season for stock, especially for sheep, and shearing operations were considerably delayed.

December brought little improvement, cold, changeable conditions prevailing throughout. Farmers wishing to turn their large surplus of grass into hay found few opportunities of doing so before the end of the year. Vegetable and fruit crops matured several weeks later than usual.

THE NEW ZEALAND OFFICIAL YEAR-BOOK, 1953


Sheldybett

Offline Rwood

  • Hero Member
  • *****
  • Posts: 1331
  • Country: nz
  • Karma: 244
  • Gender: Male
Re: New Zealand Weather Summary for 1951
« Reply #1 on: May 22, 2019, 10:29:55 PM »
There was a strong La Nina event that started early in 1950 and persisted to early 1951, giving unusually sunny conditions on the West Coast, while Canterbury had a wet year (the wettest on record in Christchurch in a very long record).

Met Service provided an update of annual sunshine averages to 1950 by the time this was published. Unfortunately these were rather misleading (too high) for several reasons. Records prior to 1935 were included in the calculation, and in several cases these were "optimistic" - most notably in the case of Napier. Standardisation of equipment and measuring methods was not done for data prior to 1935. Also, the period 1935-1950 was sunnier than the long term records have since indicated, giving a further distortion. Finally, I suspect that there was some tightening of measurement rules from about 1951, as the occurrence of 6 consecutive years (1951-1956) of lower than average sunshine, especially in the North Island, is not easy to explain, even given the earlier factors.

The net result is that I consider the assessments of sunshine deviations for the period 1950-1961 to be too negative (from about 1962 on new averages for 1935-1960 were used, and then 30-year spans for the periods ending 1970, 1980 etc were used.


The "new" average for Napier to 1960 was more than 120 hours below the dodgy number obtained for records up to 1950.
« Last Edit: May 22, 2019, 10:32:36 PM by Rwood »


Share via twitter

xx
New Zealand Weather Summary for 1932

Started by Sheldybett

1 Replies
5713 Views
Last post June 06, 2019, 08:53:25 PM
by Rwood
xx
New Zealand Weather Summary for 1935

Started by Sheldybett

1 Replies
4403 Views
Last post June 06, 2019, 08:48:39 PM
by Rwood
xx
New Zealand Weather Summary for 1938

Started by Sheldybett

1 Replies
4943 Views
Last post May 21, 2019, 05:04:40 PM
by Rwood
xx
New Zealand Weather Summary for 1941

Started by Sheldybett

1 Replies
4696 Views
Last post May 21, 2019, 05:24:00 PM
by Rwood
xx
New Zealand Weather Summary for 1944

Started by Sheldybett

1 Replies
3984 Views
Last post May 21, 2019, 06:44:11 PM
by Rwood