Actually it isn't being south of the equator. In general (there are variations), between 30 degrees and the equator, both north and south, prevailing winds are

Actually it isn't being south of the equator. In general (there are variations), between 30 degrees and the equator, both north and south, prevailing winds are easterlies; between 30 and 60 degrees, they are westerlies; then above 60 degrees they are generally easterly again.