In reply to Rampikino:
Well you're going just as spring is arriving down under.
Tons of the stuff to go at, but you'll have to treck inland to the mountains, south island better than north island.
Ask the locals when you get there.
Again depends on where you'll base yourself.
I went there years ago to visit a friend, stayed on south island and got some good sking in during July. did a bit of walking but no climbing.