New Zealand got off to a slow start but improved massively last week of August and early September. Ended up getting a metre and a half in one week and a base of 2.5 metres. Well Treble Cone did anyway. Unluckily for me I was there the week before the dump. Damn it.
If you do consider getting on the snow down here in the southern hemisphere during your travels I agree NZ is the best bet and late August to early September is usually pretty reliable.