Oceania's biggest landmass, Australia, has an overall average temperature of 12.9 C, or 55 F, as does its neighbor to the southwest, New Zealand. With low rainfall and humidity through much of Australia and winter temperatures barely dipping below freezing, the climate is quite moderate, although much of the country tends toward drought. While temperatures remain similar, New Zealand's higher humidity and rainfall keep that country green.
The smaller island chain of Fiji has an average temperature of 25.5 C, or 78 F, with incredibly high humidity year-round and large amounts of rainfall in the first few months of the year. Tahiti has similar temperatures, with slightly lower humidity and rainfall throughout the year.
Drawing a balance between tropical temperatures and the Australia/New Zealand climate, New Caledonia's yearly temperature averages 22.7 C, or 73 F. While precipitation is common, the average humidity stays at around 70 percent, slightly lower than the more tropical islands.