"Once prices started to spike up again, a huge amount of speculative money has flowed back into the kiwi."
The New Zealand dollar has been "somewhat resilient in the face of US dollar strength". The New Zealand economy would benefit from the kiwi falling back to within a range of US64c to US66c, he said.
The first test of the kiwi in 2016 may be with US non-farm payrolls this month, where the expectation is that the world's biggest economy stacked on another 200,000 jobs in the latest month, Nicholson said.
"A drop below US66c does seem quite likely," Nicholson said.
The New Zealand dollar fell to A93.78c from A94.11c on Wednesday, dropped to 62.62 euro cents from 62.73c, weakened to 46.15 British pence from 46.23p, declined to ¥82.39 from ¥82.58, and slid to 4.4416 yuan from 4.4497 yuan.
The two-year swap rate fell 1 basis point to 2.83 per cent and the 10-year swaps fell 1 basis point to 3.73 per cent.