As an illustration of what it means to have a 1°C increase in mean temperatures, it is like shifting many southern Australian towns northward by about 100 km.
A meteorologist said previous record hot years in 1988, 1998 and 2002 were caused by El Nino events, where warmer waters in the South West Pacific lead to lower rainfall and hotter weather in Australia. But there was no El Nino events in 2005. He argued that "the strong culprit has to be global warming."
Looking at the graph below, one can even argue that Australia's has been steadily getting hotter since the 1950s.
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2005 might also be one of the hottest years on record globally, since preliminary figures from the Bureau show the global temperature was around 0.48 degrees above average in 2005.
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Sydney started the year 2006 at a record high: 44 degrees in the city on New Year's Day.
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