Fog blankets Christchurch
A thick layer of fog over the city may be the beginning of a return to "wintry conditions" in Canterbury.
A MetService weather warning said a cold front was forecast to move over the lower South Island this morning.
The front was expected to bring wintry conditions in Canterbury, Fiordland, Southland and Otago.
Snow was expected to fall above 500 metres in the far south and above 600m or 700m in Canterbury.
"Although snowfall accumulations are not forecast to warrant a warning, and snow may indeed only last a few hours in most places, the combination of unseasonally low temperatures, snow and strong winds - gale about the coast for a time - is likely to affect stock, especially newborn lambs and calves," MetService said.
Travellers were warned of hazardous driving conditions on higher roads and passes.
Police said there had been no crashes in Christchurch so far today, but people should drive carefully.
A Christchurch International Airport spokeswoman said the airport was open, although there was some fog.
Some flights had been delayed by a few minutes, but all were departing and arriving.
People were asked to look at both www.christchurchairport.co.nz and airline websites to check flight details.
MetService forecaster Stephen Glassey said the fog was expected to clear quidkly.
"It developed as low cloud overnight and dropped to fog at about 4am. We are forecasting it to clear between 8am and 10am, " he said.