As a result of the mean figure of 14.8c for this June, the rolling annual CET has risen slightly from 9.68c to 9.76c, still slightly lower than the average CET of 9.95c for the calendar year to December 2008.

I have now extended the calculation of the rolling annual CET back to the start of CET records, i.e. 1659 and these are shown on the attached chart.

I think it is interesting that this reveals some annual temperatures which were earlier and higher than the calendar year averages quoted by the Met. Office. For example, while the M.O. figures show the first annual average CET of over 10c for the year ending December 1686, this was the culmination of a series of 7 rolling years of over 10c, which started in June 1686. In fact, the year ending Sept. 1686 reached a figure of 10.42c, while the M.O. calendar year averages do not show a figure this high until December 1733.

As I think I have pointed out before, the highest annual mean CET recorded is NOT 10.82c for the calendar year 2006 as quoted by the M.O. but 11.63c for the year ending April 2007.

Attached Thumbnails

 

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