I had no idea about the temperature changes, but one of the schools in the zone measured it during todays eclipse. They were a school in Essex, about 86% coverage of the sun by the moon.
They measured a temperature of 13.1 degrees Celcius before the eclipse and just after it reached the maximum eclipse the temperature was measured as 8.65 degrees celcius.
They told me these figures during a Live Chat this afternoon, it is all their work, so a big thanks to that school for letting me know that!
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