The country has had the coolest start to summer in almost a decade.
Temperatures around the main cities on Monday were well below the median for the past decade, as a southwesterly flow swept through.
"It's unseasonable, but it's not [completely] unusual," MetService forecaster Richard Finnie said.
Temperatures for December 1 have fluctuated for the last decade between as hot as 27C and as cold as 13C. This year was the coolest since 2006.
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