Alpine areas also experience record-breaking heat with snow depth recorded at zero in Kosciuszko national parkGet our breaking news email, free app or daily news podcastAustralia had its second hottest September on record last month as global heating and a strengthening El Niño combined to break a string of heat records around the country.Bureau of Meteorology data showed the minimum night-time temperatures across the continent were also the hottest for any September on a record that goes back t