Hi Gordo, I lived in New Zealand and had land with goats on it about half the time I was there. I would not consider myself a goat farmer, but I did a lot of research there. You are not quite right about the temperatures there, but there are four or 5 different climates there, and so different areas vary over different temperature ranges. In general, it is a whole lot cooler there than you seem to thing. There is two months of summer, January and February, when temperatures range between 15 and 22 deg. C for lows, and 22 and 29 degrees C for highs. 35 deg. C won't happen south of Auckland, and are really rare and Auckland. But can happen in areas that are sheltered by large mountain ranges, especially on South Island. Winters are cold and long. Whereas Summers are two months long, winters are 5-6 months long. In the winter in rains almost all the time everywhere. And on south Island they have wide areas of snowfall. So, many places are near or below freezing on South Island much of the Winter. North Island is warmer. Winter temperatures vary between lows of 2 deg. 9 deg. C to . to highs between 9 and 17 deg. C. And this is the pattern for about half the year.
People who keep goats dip them regularly to control insects. Goats enjoy a smorgasbord of food, lots of foods and flavors, you can move them around by localizing their food sources. And keeping them on the move better manages your land. I liked what was said about providing them with clean, dry quarters. Maybe several
shelters around the property, so you can keep them moving.