2014 was Australia's third hottest while brushfires blaze in three states

Australia experienced its third-hottest year on record in 2014, paving the way for an early start to the bushfire season, scientists said yesterday while hundreds of firefighters were battling blazes in three states.

The biggest concern is a huge blaze in South Australia's Adelaide Hills, with firefighters racing to contain an inferno that has destroyed up to 38 homes ahead of worsening weather conditions.

Wildfires are also burning in Western Australia and the southern state of Victoria, officials said, as the Bureau of Meteorology confirmed 2014 was "Australia's third-warmest year since national temperature observations commenced in 1910".

"Much of Australia experienced temperatures very much above average in 2014, with mean temperatures 0.91 degrees Celsius above the long-term average," said the bureau's Neil Plummer.

The agency said that following Australia's warmest year on record in 2013, both maximum and minimum temperatures remained well above average in 2014, with "frequent periods of abnormally warm weather".

The years since 2002 have seen seven of Australia's 10 warmest years on record, the weather agency added.

Sarah Perkins, a research fellow at the University of New South Wales' Climate Change Research Centre, said Australia had sweltered through prolonged and extreme heatwaves in 2014 and its hottest spring ever.