Thursday tested longstanding heat records for communities across South Australia's north, with the outback town of Marree reaching 49.8C. It's really not pleasant out there," Mr Smith said. While 49.8C was the official maximum recorded on Thursday, Mr Smith said his car's thermometer showed 50C. Casey Bowie, who moved to Roxby Downs from Townsville last week, told AAP she had never experienced heat like Thursday. Mr Narramore said average temperatures in Australia were one to one and a half degrees higher than they were a century ago.