How much temp difference can happen in 15 km ( smilar elevation)?

How much temp difference can happen in 15 km ( smilar elevation)?

Airport Station station gets about 8-9-10°C colder low than the The City at Clear Night, which is like 15 km distance.

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Airport is 15 km away from the City
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I googled the question writting the distance, I can't have answer
How much temp difference can happen in 15 km ( smilar elevation)?
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