I simply base my comment regarding frequency of El Nino/La Nina on the water levels at Copperlode Dam.
When Cairns has water restrictions - El Nino.
When Copperlode is spilling water - La Nina.
Generally a 10 to 14 year cycle from El Nino - La Nina - El Nino.
On what do you base your comments regarding the El Nino/La Nina cycle?