Check the weather before you go.

The weather in New Zealand can change from a warm sunny day to freezing in a short time, particularly in the high country. It is most important to check the long range forecast before you leave home.   Always carry adequate wet weather gear  regardless of the forecast.   These are just three of the  many sites available to get up to date weather advice for planning your trip.

New Zealand Avalanche Advisory

https://www.yr.no/en/forecast/daily-table

https://www.metservice.com/