By Paul Homewood

h/t Paul Weldon

As you will remember, I challenged the Met Office’s claim that this summer was the hottest on record in England, when the CET said no such thing. As I pointed out, not only did they claim it was the hottest in England, but also in the Midlands region, which is geographically similar to the area covered by CET.

Paul has looked more closely at the long term comparative trends, and prepared these graphs:

For most of the record since 1910 CET mean summer temperatures ran hotter than the Midlands, but in the last few years the gap has virtually disappeared, as the second chart shows.

Paul has also worked out the decadal average differences, which indicate that the Midlands summer temperatures have increased by about 0.4C more than CET has since the early 20thC.

Given the careful way in which the CET has been compiled, this raises the question whether UHI or changes in the mix of stations has affected the Met Office’s Midlands data.

As far as UHI is concerned, CET adds 0.2C to temperatures prior to 1970, to allow for UHI, which would help to explain some of the differences up to then. But this cannot account for the differences since 1970.

This raises more questions about the accuracy of the Met Office’s UK dataset.

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September 25, 2018 at 01:12PM