Weather 19921992 was a very significant year for weather in New Zealand. It was very cold, with south-westerlies for much of the year. Easterlies prevailed from September. These, together with more frequent low pressure systems east of the North Island, produced especially cloudy weather over much of the North Island and northern South Island.
The national average temperature of 11.7°C (0.8°C below average) was the lowest since 1945. This was particularly noticeable after the 1984–1990 period which was very warm. Temperatures were 1.5°C below those of 1990 and 0.7°C below those of 1991.
The weather was cooler due to the El Niño weather pattern (which was present during the first part of 1992) and the effects of the ash from the Mt Pinatubo volcanic eruption (still present) back in June 1991. There were also more south-easterly airstreams over New Zealand, which always bring cooler conditions. Very cold winter weather in inland South Island areas had temperatures as low as
−15°C measured at Ranfurly in Central Otago on 19 June. The highest temperature of the year was
34°C at Alexandra on 11 March.
Figure 1.2. WEATHER
Sunshine hours (annual average to 1990)
A blanket of snow covering farm machinery at Pukehiki Church, Dunedin.
Winter snowstorms. Snow occurred in Otago and Canterbury on 9–11 May, then heavy snowfalls occurred in Otago and Southland for much of the week from 16 June which gave record low day and night time temperatures. More heavy snow occurred in Canterbury and inland Marlborough from 8–11 July. Later, very cold south-easterlies brought the most severe snowstorms since 1939 along the east coast of the South Island from 27–29 August.
Floods. Severe flooding occurred in Northland, Hawke's Bay and Wairarapa from 21–23 July. Waitohora, Wairarapa measured rainfall totalling 195 mm for the 48–hour period to 9 am on 23 July, with numerous slips and road closures throughout the region.
New Zealand Official Yearbook 1993.