That’s quite interesting. None of those are particularly large airports, with the exception of MSP. As UHI effects go, I don’t know much about La Crosse or Duluth, but I know UW-Madison is basically downtown while the airport is way out on the east side, so it’s interesting that the airport would run so much warmer, especially being the small regional airport that it is. With that being said, it does appear that records at La Crosse airport date back to 1938, so I would say it’s valid to compare any data from then to now. But I’m wondering if it’s maybe more of a geographical thing than a UHI thing, at least in that case.