If the urban heat island effect were large, you would expect to see a bigger trend for calm days when more of the heat stays in the city.
BBC: NEWS | Special Reports | 629 | 629 | Climate scepticism: The top 10
When these stations observe a temperature rise, they are simply measuring the "urban heat island effect".
Greenery is critical to counterbalance the "urban heat island" effect from hotter, drier summers, when night-time temperatures remain high because of heat retained by brick and tarmac.
BBC: Time to leave the comfort zone
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