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Wintry conditions are again causing issues for travellers in the South, delaying flights and making roads treacherous.
Dunedin Airport says fog is affecting services this morning, and advises passengers to check flight times with their airlines. Services were affected for a time yesterday morning as well.
There has been a multi-vehicle crash on Dunedin's Southern Motorway, the southbound lanes of which were closed for a time around the Riselaw Rd overbridge. They have since reopened.
Police say crashes have also been reported in Roxburgh and Cromwell, and in Lumsden in Southland, and they are urging motorists to drive to the conditions.
State Highway 8 was closed between Lake Tekapo and Twizel, because of black ice. It fully reopened just before noon.
NZTA is also advising caution on SH1 between Dunedin and Palmerston, and on sections of SH87 and SH85.
Inland, the Central Otago District Council says there are reports of black ice and thick fog in many areas including Cromwell, Omakau and Alexandra.
"Trucks have been out gritting trouble areas, and we will continue to monitor."
The Queenstown Lakes District Council says there is a thick freezing fog in some areas, "which means damp roads and ice".
Crews have been applying grit and CMA, but the council said in some areas such as Fernhill and Queenstown Hill the roads were getting too cold and the CMA wasn't as effective.
The Glenorchy road, which has had significant ice issues in recent days, looks to be problematic again today. The council said road crews were working non-stop from 5am until 3.30pm yesterday and they would likely do the same today.
Orbus advises that buses unable to travel into Sunshine Bay/Fernhill due to ice this morning.
MetService meteorologist Devlin Lynden told RNZ the low temperatures had been a result of clear skies overnight.
"We've seen frosty temperatures right around the country. And as far north as Auckland really, which is pretty rare for them," he said.
The Auckland suburb of Whenuapai dropped down to 1.3C this morning, while temperatures dropped below 0C in several other regions, including Hutt Valley.
Parts of the central North Island plummeted to -5C and the Central Otago settlement of Lauder was greeted by a biting -6.3C.
Many other places from Canterbury to Southern Lakes, Central Otago, Dunedin and Southland were sitting between -3C and -5C, Lynden said.
Freezing conditions were set to continue for parts of the country over the next couple days.
"Tomorrow will be another cool one. This ridge of high pressure will stick around a wee while longer, possibly even a bit cooler than it has been this morning in a few places," Lynden said.
"But as we move closer to the weekend, these cooler temperatures are unlikely to stay around. A front moves in [consisting of] quite a warm, moist air mass moving in from the north.
"So I would expect temperatures to rise up and also as we head into the weekend, some rain for both the South and North Island through the weekend."
- Allied Media/RNZ