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Aotearoa New Zealand has just experienced its warmest winter on record – well exceeding the previous record which was set just last year.
A record-equalling top temperature of 23ᵒC in Akaroa on Tuesday prompted a feeling of déjà vu for NIWA forecaster Ben Noll.
A closer eye is now being kept on Stewart Island’s climate thanks to the installation of a new electronic weather station.
New Zealand has just experienced its warmest June and July since records began in 1909 and – with one month to go - is on track for its second successive warmest winter on record.

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2019 New Zealand Climate Summary
NIWA climate scientist Nava Fedaeff presents the NIWA annual climate summary for New Zealand 2019.
Annual Climate Summary for 2018

New Zealand’s equal-2nd warmest year on record. Annual temperatures were above average across the majority of New Zealand, including much of the North Island as well as the western and southern South Island. See complete 2018 Annual Climate Summary details.

Weather Tips - What is El Niño?

El Niño. We hear it being brought up in the news quite a bit, but what does it actually mean? No, it's not a type of yoghurt!

NIWA Weather forecasts and rainfall maps for New Zealand towns and cities.

The NINO3.4 Index anomaly (in the central Pacific) during August was -0.17 ̊C. The Southern Oscillation Index was +0.5. While both remained in neutral territory, other indicators trended toward La Niña.
New Zealand’s second consecutive warmest winter on record
A warm finish to winter for most of the country
Aotearoa New Zealand has just experienced its warmest winter on record – well exceeding the previous record which was set just last year.
Spring rainfall is most likely to be below normal in the east of the North Island, near normal in the west of the South Island, and about equally likely to be near normal or below normal in all remaining regions across Aotearoa New Zealand.
A record-equalling top temperature of 23ᵒC in Akaroa on Tuesday prompted a feeling of déjà vu for NIWA forecaster Ben Noll.
A closer eye is now being kept on Stewart Island’s climate thanks to the installation of a new electronic weather station.
New Zealand has just experienced its warmest June and July since records began in 1909 and – with one month to go - is on track for its second successive warmest winter on record.
The NINO3.4 Index anomaly (in the central Pacific) during July was 0.08 ̊C. The Southern Oscillation Index was +1.7, firmly in La Niña territory.
Heavy downpours and unseasonable warmth
Temperatures are most likely to be above average in all regions of the country. More northwesterly air flows will likely cause spells of unseasonably warm temperatures in the north and east of both islands in particular.
Flood flows on the Buller River this month were the largest of any river in Aotearoa New Zealand in almost 100 years, NIWA measurements show.
The NINO3.4 Index anomaly (in the central Pacific) during June was 0.18 ̊C, the first time it has been positive since July 2020. The Southern Oscillation Index was +0.4, in the ENSO neutral range.
A NIWA climate scientist has combined work and a sporting interest to benefit golfers throughout New Zealand.
New Zealand’s warmest June on record
A weather roller coaster is coming to town and country before the end of the month.
Preliminary analysis by NIWA climate scientists has shown that the recent Canterbury rainfall was so extreme in some inland places that it could be expected to happen only once every 200 years.
The prodigious rainmaker that hit Canterbury earlier this month saw NIWA field teams out in the elements collecting flood data from bridges, cableways and jetboat gaugings.
The NINO3.4 Index anomaly (in the central Pacific) during May (through the 30th) was -0.11˚C, the smallest anomaly since July 2020. The Southern Oscillation Index (SOI) was +0.5, in the ENSO neutral range.
A warm autumn with bursts of heavy rainfall
Severe flooding in Canterbury to end the month
Temperatures are most likely to be above average in the west and east of the South Island and about equally likely to be above average or near average in all other regions. While cold spells and frosts will occur, as is typical during winter, they may be infrequent.
NIWA forecasters say expected clear skies are looking good for spotting the Super Blood Moon on Wednesday night.
The NINO3.4 Index anomaly (in the central Pacific) during April was -0.30⁰C and the SOI (Southern Oscillation Index) was +0.3, both within the neutral range.

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