The Moon's orbit is tilted by approximately five degrees compared to the Earth-Sun plane. The net affect of this is that the strength of Lunar-tides at a given latitude on the Earth's surface vary in strength over a cycle of 18.6 years. This 18.6 year Draconic cycle is also clearly evident in the small changes that take place in the rate of rotation of the Earth.
The above graph clearly shows that Victoria experienced increased annual precipitation around 1917, (1936), 1955, 1973-74, 1992, and 2010-11. These years are separated by ~ 18.6 years and occur at times which correspond to peaks in the strength of the Draconic tides.
Why is the Australian BOM ignoring this obvious piece of evidence that connects the annual rainfall in Victoria to long-term changes in the Lunar Tides?
Will they be ready for the next period of increased precipitation around 2029?
Please refer to the following papers for a possible explanation of this phenomenon:
Wilson, I.R.G., Lunar Tides and the Long-Term Variation
of the Peak Latitude Anomaly of the Summer Sub-Tropical
High Pressure Ridge over Eastern Australia
The Open Atmospheric Science Journal, 2012, 6, 49-60
Southern Hemisphere, The Open Atmospheric Science Journal,
2013, 7, 51-76