The southern part of the nation, from Brisbane across to the west coast, experienced its warmest year on record -- the Murray Darling Basin region in particular.
The chief executive of the Murray Darling Basin Commission, Wendy Craik, said while inflows to the basin were slightly improved this year, most recent figures again showed they were heading in the wrong direction.
She said there was enough water to keep most permanent plantings along the river alive over summer, but warned the level of the Murray in the lower lakes could fall from its present level of 1cm above sea level to 60cm below by March next year.
"The way we are operating the river is like nothing in living memory," Dr Craik said.
"While there had been good rainfall in November, higher temperatures, evaporation and lower runoff kept inflows well below average. Inflows over the 2006-07 were just 55 per cent of the previous minimum on record. The two years to the end of November were the lowest two-year inflows on record."
Their comments came in response to the latest assessment of global climate conditions released yesterday by the World Meteorological Organisation. It said the decade between 1998 and 2007 was the warmest on record, with average temperatures rising by about 0.4C.