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Temperatures in the upper North Island have been colder than in many South Island areas this morning.

It was minus three in Auckland and minus four in Hamilton. Those temperatures are the coldest of the year so far, and far colder than overnight temperatures in the South Island which are mainly in the positive range.

Weather Watch analyst Philip Duncan says it is very strange to see the normal temperature ranges throughout the country, reversed.

"That's basically due to the fact that the cold air left over from the Antarctic blast last weekend still remains across Northern New Zealand, while the rest of the country has seen a bit of a change overnight with clouds and a slight breeze developing ahead of another cold snap."

Mr Duncan says a change is coming which will raise the minimum temperatures, but lower the highs.

In the South Island, black ice caused four accidents in the space of an hour in Motueka early this morning.

Sergeant Rob Crawford said a light rain at 5am caused the black ice.

"It iced everything up," Mr Crawford said.

He said the four accidents between 7.30am and 8.30am caused no injuries
but there was severe damage to the vehicles.

Mr Crawford said the morning sun is improving conditions and local
contractors have put grit on the roads.

Meanwhile MetService has forecast light snow showers on the Milford Rd
near the Homer Tunnel.

MetService is forecasting showers could turn to snow before clearing this evening with up to 2cm accumulating in the road.