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High rainfall in the east and north for August

August was dominated by big Tasman Sea lows with sub-tropical connections moving over New Zealand, towards the end of August this pattern began to change to the more spring like systems we will be getting from now on.

The sub-tropical connections and the nature of the lows bringing mainly east to northeasterly winds meant rainfall was high in the east and north of the South Island and a similar pattern occurred over the North Island, yet out west in the South Island conditions have been rather dry overall and Southland has broken low rainfall records. Rainfall figures for western areas of the North Island were close to average for the month of August.

Another result of the airflow coming from the northeast made it a mild August compared to normal. And naturally the areas experiencing low rainfall received the highest amount of sunshine hours. Here are a few figures courtesy of NIWA:

• The highest temperature was 22.7°C, observed at Christchurch on 26 August.
• The lowest temperature was -5.3°C, recorded at Ranfurly on 23 August.
• The highest 1-day rainfall experienced was 198 mm at Akaroa on 12 August.
• The highest gust recorded was 135 km/hr at Puysegur Point, Fiordland, on
25 August.
• Of the six main centres in August 2012, Auckland was the warmest and sunniest, Tauranga the wettest, Christchurch was the driest, and Dunedin the coolest and cloudiest.

Homepage image / Mandeno Moments –

By weather analyst Aaron Wilkinson, – Data courtesy of NIWA


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