NZ in winter

I’m looking into spending a few months over in NZ to ride mountain bikes and maybe work a bit. As I’m not sure if I make it this summer I was wondering how the conditions are in autumn & winter. I guess I would need to look into going to the North Island, Rotorua maybe for that time of the year, dont I? I spent some time on the South Island around Queenstown and Wanaka but I assume riding there in winter is pretty much impossible isnt it?

I spent a year living in Auckland. That winter was the shittiest winter of my life.

Reading journals of people touring the South Island in autumn it looks like there’s a fair bit of sunshine. Cold but.