For the first time, the Bureau of Meteorology has provided a national definition of a heatwave.
A heatwave is now defined by three or more days of unusually high maximum and minimum temperatures in any area.
Seems we had a different definition in the not so distant past...
The Great Heatwave of 1908, the year BOM was formed, provides a different definition and a reminder that what goes around may come around again....Thankfully in these enlightened times, along with an approved heatwave definition, we also have access to air con.
BOM still records January 1908 as having the highest January monthly mean on record for Melbourne at 31.0. There were 6 days in a row over 39.9 degrees including a run of 5 over 40!