The New Zealand weather wasn't easy to deal with. A lot of rain wherever we went. The good thing was that with our camper we were flexible and the metservice forecast was astoundingly accourate, which took me a while to realize.
When we were in Tongariro National Park it was all rain and storm. We had planned two days there and I wanted to do the crossing on day two. But after a freezing night and a constant downpour in the morning we decided to head for the only place on the North Island where the forecast still showed some sun.
A real good decision. For one thing we were nearly the only people visiting + I had some sweet light at sunset.