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New Zealand Climate Update 136 – October 2010

What happened in September, how our climate outlook for the previous three months turned out, global and local sea temperatures, and our outlook for October to December.

Current Climate - September 2010

September 2010 was characterised by extremely low pressures over New Zealand, bringing wild westerly winds. The effect of the stronger-than-normal westerly winds during September was very clear – rainfall was record high or well above average, and sunshine hours were well below average, in western areas of both islands. It was also much cooler than usual in the west and south of the South Island, but warmer than average in eastern areas; both are trademarks of enhanced westerly circulation.

Outlook - October to December 2010

During Oct-Dec, mean sea level pressures are likely to be above normal over and south of New Zealand. Temperatures are very likely to be above average in all districts except for the east of the South Island, where above average is likely. Seasonal rainfall is likely to be near normal or below normal in the east of both Islands and the southwest of the South Island, and near normal elsewhere.

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