Last month was the coldest May in 10 years, the National Institute of Water and Atmospheric Research says.
Principal scientist Dr Jim Salinger said the average temperature was 11C.
The lowest temperature for the month was minus 5.9C at Lake Tekapo on May 15.
The highest was 23.6C in Henderson, Waitakere City.
Dunedin was the driest of the main centres, Auckland the wettest, Hamilton the sunniest and Christchurch the coldest.
Coldest May in 10 years
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