Ko ngā hau matua e pupuhi ana i ia taha o te weheruatanga o te ao. Ki te raki o te weheruatanga o te ao, ka pupuhi te hau weherua mai i te rāwhiti mā raki. Ki te tonga o te weheruatanga o te ao, ka pupuhi te hau weherua mai i te rāwhiti mā tonga. Nā te mahana o tēnei wāhi o te ao, ka rere whakarunga te hau takiwā mahana, ā, ka rere mai anō he hau takiwā mātao mai i te tonga, mai i te raki rānei ki te whakakapi i te wāhi i whakarērea ai e te hau takiwā mahana.
The prevailing winds on either side of the equator. To the north of the equator, the trade winds blow from the north east. To the south of the equator, the prevailing wind blows from the south east. Because of the warmth of this part of the world, the warm air rises and is replaced by colder air from the north or south.