New Zealand climate in September
September was a relatively benign month with more anticyclones and less wind than normal, and less extremes. Rainfall was lower than normal in many areas, especially in the west of the NorthIsland. Temperatures were above average in many North Island areas. The national average temperature of 10.5 ºC was 0.1 °C above the historical normal.
For more information see www.niwascience.co.nz/ncc/cs/mclimsum_07_09
Soil moisture deficit
Soils were drier than normal in eastern Marlborough and north Canterbury.
Stream flows were below normal in east coast regions, normal to above normal elsewhere in the North Island and near normal else where in the South Island.
July to September: the climate we predicted and what happened
Predicted: Normal or above normal rainfall in the north and east of the North Island; normal elsewhere.
Outcome: Above normal in Northland and parts of Hawke’s Bay. Below normal in the northern half of the South Island. Normal in many other areas.
Predicted: Above average in the North Island and north of the South Island; average or above average in the west of the South Island, and average in Canterbury and East Otago.
Outcome: Average over the South Island, and mostly above average over the North Island.
Predicted: Normal in most of the country, except for normal or below normal in the east of the South Island apart from Marlborough.
Outcome: Stream flows were below normal in Nelson-Marlborough and the South Island east coast, and mainly normal elsewhere.