Towns and cities on the west coast of the North and South Islands were ``unusually sunny in 2012'', Ms Griffiths said.
They experienced the largest jump in sunshine hours, thanks to weather conditions keeping areas relatively dry last year.
New Plymouth, Greymouth, Te Kuiti and Paraparaumu all had their sunniest years on record.
Greymouth's stellar year saw its residents experience 25 per cent more sunshine than it would normally get, Ms Griffiths said.
"It's been a really nice time in Greymouth last year,'' she said.
Wellington, Wairarapa and parts of Northland and Central Otago experienced below-average sunlight hours last year.
Auckland was about average, Ms Griffiths said.
NIWA's full summary of last year's weather is expected to be released next week.
The six sunniest spots in 2012
1. Whakatane, 2602 hours of sunshine
2. Nelson, 2584
3. Lake Tekapo, 2562
4. Appleby, in Tasman Bay
5. Blenheim
6. New Plymouth