The bitterly cold southerly which brought snow to most parts of the country earlier this week is retreating, but widespread frosts are taking its place.
Frosts have been creeping further eastwards and tonight and tomorrow morning they will be the most widespread they have been this week, and possibly this year, WeatherWatch analyst Philip Duncan said.
"Tonight we'll see more frosts around sheltered parts of Wellington, Wairarapa, Hawkes Bay and Gisborne and heavier frosts across Canterbury."
The southerly was expected to clip Wellington, Gisborne and a few coastal places before losing its puff, Mr Duncan said.
Black ice risks remain in many areas where roads are wet from either melted snow or earlier rain.