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That link states
“Heathrow - with its large black asphalt runways and airport buildings - naturally absorbs more heat. “
Absorbs? I’m no physicist but don’t dark surfaces convert light energy into heat which radiates into the adjacent area, ie, the air adjacent to the weather station - especially if it’s downwind?
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dark surfaces convert light energy into heat
Its a bit more about infrared radiation than visible light I think but thats being a bit nitpicky.
https://www.scientificamerican.com/article/how-exactly-does-light-tr/
Why Heathrow is hot:
https://www.bbc.co.uk/news/uk-44980493?s=08