To be clear, the Bureau changes a perfectly good temperature series from Cape Otway lighthouse by remodeling it so that it has Melbourne’s temperature signal – all through the process of homogenisation.
Government agencies in the USA have done exactly the same thing to temperature records for Colorado.
BP’s latest Energy Outlook report, published yesterday, estimates that more than 2.5 trillion barrels of oil have been discovered worldwide and technically could be extracted.
For example, in a recent study of temperature variability and change for south-east Australia it is evident that maximum temperatures in the cities of Melbourne and Hobart are increasing at a rate of about 0.8 degree Celsius per century; while the rate of increase at the nearby lighthouses is half of this.
While the trend of about 0.4 degree Celsius per century at the lighthouses – as shown in Chart 1 – is arguably an accurate record of temperature change, the Australian Bureau of Meteorology changes this.
Note that it is calibrated in tenths of a degree Celsius and that even that tiny amount of warming started long before the late 20th century.
The horizontal line is totally arbitrary, just a visual trick.
" There has been no change in UK average temperatures in summer(JJA) or in Spring(MAM) for the last 367 years.
The two hottest summers were 1826 (17.6C) and 1976(17.8C).
What that does however is highlight how tiny and hence how trivial are the changes they deal in: Tenths and hundredths of one degree.
To changes as small as that, the only reasonable response is "Who cares?
Monthly averaged temperatures for winter(DJF), Spring (MAM), Summer (JJA) and Autumn (SON). Now add graduations linearly the length between the two and WALAA............a thermometer.