In the past RFD did really well when drought conditions were present. I remember back in 2012 they were one of the hottest spots in IL till they finally got some rain and then other places like MLI and ORD were hotter again. As for LAF they seem pretty erroneous compared to surrounding sites on a consistent basis.
Hottest day of the year so far here at 92, MLI/DVN languished at only 91/88 respectively.