Snow has now stopped falling in Christchurch, leaving just a fine layer settled on parts of the city.
Latest forecasts for the city show snow easing off this morning, turning to showers and hail this afternoon.
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Further snow is possible overnight and tomorrow morning.
Heavy rain is still expected over the next 24 hours making driving conditions dangerous.
Surface flooding is an issue in low-lying areas across the city, with the council asking drivers to take care.
The council also warns that earthquake-damaged wastewater systems remain fragile in parts of the city and have been blocked by rain.
"It's possible flooded roads and parks may be contaminated, so avoid the water where possible or make sure you wash your hands and remove and wash any clothing that gets wet," a city council spokesman said.
"Hill roads are currently extremely dangerous for motorists and should be avoided until later this afternoon.
"The weather will remain wet and cold over the weekend. People are asked to check in on older people or those with disabilities who live alone in their neighbourhoods."