Ken Stewart and Jo Nova have reported on the BoM claim. BoM mean T data for the 12 months September 2012 to August 2013 was the warmest on record for their dataset. You can not make a 12 month average of your choice – I downloaded all monthly anomaly timeseries and built a full timeseries of monthly anomalies from 1910-2013.
The only “international” surface temperature data I can find updated through August is GHCN CAMS from KNMI ClimateExplorer. Then we also have the NASA lower troposphere satellite data from the University of Alabama at Huntsville (UAH) commented on by Ken and Jo. It is clear from the graphic that the BoM claim is not robust.
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Over the decades the 12 month average “Australian mean temperature” oscillates in a cyclic fashion between warm and cool anomalies. The BoM opportunistically feeds media headlines when times are warm but is silent on the issue when times are cool.
Is it normal for the BoM to release year-on-year figures at the end of seasons? If not, it seems possible that this release, rushed out as it was on September 2, was designed to play a part in the September 7 Australian election.
Just from memory John – I recall this practise of quoting odd 12 month periods and even more odd periods – commenced last summer. Around the time the BoM started quoting their “all Australian land area average” daily max temperature series. Which I am not sure they have ever made available for download. The first prominent use of this time series was last January – see ABC article –
Australia swelters through hottest ever day –
The previous all-time high was in 1972 – which as I recall nobody outside the BoM was aware of.