The urban heat island effect adds far more non-climatic heat to temperature station records than can be reliably controlled for.

Yet most temp reports come from airports! - Bjørn K Vottestad 

An analysis of 10 cities from across the globe (Kara and Yavuz, 2025) reveals airports and industry centers are, on average, 2.5°C to 2.8°C warmer than neighboring green spaces...
The urban heat island effect can leave airports and industrial centers as much as 12°C warmer than nearby vegetated, forested areas...
notrickszone.com
New Study: A City’s Industry Center, Airport Up To 12°C Warmer Than Nearby Forests, Vegetation
An analysis of 10 cities from across the globe (Kara and Yavuz, 2025) reveals airports and industry centers are, on average, 2.5°C to 2.8°C warmer than neighboring green spaces.