The dry conditions of the last three years have been particularly acute during the cool season, which is important in many regions for generating runoff. Rainfall for the period from April to September was less than 50% of average in all three years in 12/30 rainfall districts of New South Wales. The very much below average October rainfall over most of New South Wales and the Murray–Darling Basin as a whole has further exacerbated the effect of low inflows to date.
Rainfall averaged over Australia has been very much below average for the first six months of 2019 (driest January to June period since 2005). A positive Indian Ocean Dipole (IOD) event is likely throughout winter and spring 2019, which would typically result in below average winter–spring rainfall over southern and central Australia. This makes it likely that 2019 will be a drier than average year for Australia as a whole.
Here are some resources to help explain how the drought is affecting the various regions in Australia.
http://www.bom.gov.au/climate/current/
https://www.pmc.gov.au/
https://www.dpi.nsw.gov.au/climate-and-emergencies/droughthub/cdi
https://www.business.qld.gov.au/industries/farms-fishing-forestry/agriculture/rural-disaster-recovery/drought/declarations-revocations/maps-declared-areas
https://www.water.vic.gov.au/dry
https://www.pir.sa.gov.au/grants_and_assistance/drought_support
https://securent.nt.gov.au/prepare-for-an-emergency/droughts
https://www.agriculture.gov.au/ag-farm-food/drought/drought-policy
https://www.agric.wa.gov.au/climate-land-water/climate-weather/dry-seasons-and-drought
https://dpipwe.tas.gov.au/agriculture/government-and-community-programs/drought-assistance-for-tasmania