Seasonal Climate Outlook

During September 2014, borderline El Niño conditions returned in the Pacific.

The equatorial Pacific Ocean remains ENSO-neutral at the end of August 2014.

The equatorial Pacific Ocean continues to remain ENSO-neutral at the end of July 2014, with atmospheric and oceanic conditions failing to sufficiently couple to initiate an El Niño event

While above normal sea surface temperatures across the Tropical Pacific Ocean have crossed El Niño thresholds in June 2014, most atmospheric indicators (e.g. sea level pressure, convection, trade winds) have remained at neutral levels, indicating that El Niño conditions have not yet become fully established.

During June–August 2014, mean sea level pressures are expected to be lower than normal to the northeast of New Zealand, and weak lower than normal pressures are expected over the country.

May–July temperatures are most likely (50% chance) to be average for the west of the South Island, above average (50% chance) for the east of the North Island, and average or above average (40-45%) for all remaining regions of New Zealand. Cold snaps and frosts can still be expected in some parts of the country as autumn advances into winter.

The equatorial Pacific Ocean continued in a neutral state (neither El Niño nor La Niña) in March 2014. International guidance indicates that ENSO-neutral conditions are the most likely outcome for the next three months (April – June 2014).

During March–May 2014, mean sea level pressures are expected to be lower than normal to the north of the country, with higher pressures than normal to the southeast of New Zealand.

The equatorial Pacific Ocean continued in a neutral state (neither El Niño nor La Niña) in January 2013.

The equatorial Pacific Ocean continued in a neutral state (neither El Niño nor La Niña) in December 2013.

The equatorial Pacific Ocean continues in a neutral state (neither El Niño nor La Niña) in November 2013.

The equatorial Pacific Ocean continues in a neutral state (neither El Niño nor La Niña).

Near or above average temperatures are expected to continue across the country for the coming three months.

After a very warm winter, the coming spring is likely to have near or above average temperatures across the country.

A warm early spring on the cards

Mild conditions likely to continue over late winter.

Mild winter very likely.

Mild early winter on the cards.

Mild conditions for late autumn.

Mild autumn on the cards.

Return to near normal over the coming season.

Wetter in west and drier in east likely to continue.

Normal to dry summer for the north & east of North Island.

Normal to dry early summer for North Island, Nelson and Marlborough.