Major airport weather stations have to get their act together and strive for accuracy; MKE's weather station is always several degrees higher than surrounding ones on offshore warm days like yesterday and today. Both days they hit 90F, but Timmerman and Waukesha, the closest local ones, were both in the mid 80s. Meanwhile ORD was generally lower than the weather stations around them, which I find odd as others have mentioned. As a weather geek, it kind of irks me that we can't trust major local airport weather stations as accurate imo.