ENSO figures these days are the highest since November 2000. The monthly average back then was +22.4, today's figure is +18.3.
Any figure above +5 indicates La Nina conditions for Australia - wetter weather in the South East, especially during the winter. Floods in western NSW occur during La Nina episodes.
Any figure below zero indicates El Nino conditions - dryer conditions in South East Australia and the harbringer of drought.