Any of a number of alpine lakes in the mountains would be frozen over in the winter. If I had to choose one, I'd plump for Lochnagar in the upper Shotover. because it is at high altitude, and in a generally 'clear air' region.
Other candidates would be ones such as Lake Onslow in the mountains near Roxburgh, or Lake Alta on the Remarkables Ski Field.
The Crater lake in Mt Ruapehu would not make the list because it very much has thermal heating from its dormant volcano.
The second Largest lake in New Zealand is Lake Te Anau
Lake Taupo
Lake Ruataniwha is a lake in New Zealand not far from Twizel. It is in New Zealand's South Island in the Mackenzie District.
Lake Grassmere, a shallow lake series near Blenheim in Marlborough. They will have a website with info on it. look for 'saltworks+new zealand'.
New Zealand's largest lake is Lake Taupo in the North Island. Lake Te Anau is the South Island's largest lake, and has a town of that name on its shore.
June to August are the coldest.
Lake Taupo in the centre of the North Island is the largest lake in New Zealand.
The second Largest lake in New Zealand is Lake Te Anau
Four of the large lakes of New Zealand include Lake Taupo, Lake Te Anau, Lake Wakatipu, and Lake Wanaka.
The second largest lake in New Zealand is Lake Te Anau, in Southland, NZ.
Tarawera is a name of a mountain and also a lake in New Zealand. Mount Tarawera is the volcano that has had one of the largest eruptions on New Zealand.
Lake Kanieri is on the West Coast of the South Island of New Zealand. The closest township is Hokitika.
lake taupo
There is an island Lake Wakatipu in the South Island of New Zealand.
Taupo
Lake Ellesmere in Canterbury.
lake coleridge