July 13 high temperature records for all Illinois USHCN stations which were operating in both 1930 and 2011
Illinois ALEDO 7/13 109 : 1936 ANNA 2 NNE 7/13 104 : 1966 AURORA 7/13 108 : 1936 CARLINVILLE 7/13 109 : 1936 CHARLESTON 7/13 106 : 1936, 1954 DANVILLE 7/13 109 : 1936 DECATUR WTP 7/13 108 : 1936 DIXON 1 NW 7/13 107 : 1936 DU QUOIN 4 SE 7/13 109 : 1936 GALVA 7/13 110 : 1936 HARRISBURG 7/13 113 : 1936 HILLSBORO 7/13 107 : 1936 HOOPESTON 1 NE 7/13 110 : 1936 JACKSONVILLE 2E 7/13 108 : 1936 LA HARPE 7/13 108 : 1936 LINCOLN 7/13 110 : 1936 MARENGO 7/13 106 : 1936 MINONK 7/13 101 : 1921, 1966 MONMOUTH 7/13 109 : 1936 MORRISON 7/13 107 : 1936 MT CARROLL 7/13 105 : 1936 MT VERNON 3 NE 7/13 112 : 1936 OLNEY 2S 7/13 109 : 1936 OTTAWA 5SW 7/13 110 : 1936 PALESTINE 7/13 111 : 1936 PANA 3E 7/13 107 : 1936 PARIS WTR WKS 7/13 108 : 1936 PONTIAC 7/13 106 : 1936 RUSHVILLE 7/13 110 : 1936 SPARTA 1 W 7/13 112 : 1936 URBANA 7/13 105 : 1936 WALNUT 7/13 108 : 1936 WHITE HALL 1 E 7/13 107 : 1936 WINDSOR 7/13 107 : 1936
Real Science 
A record high set at O’Hare Airport (a big concrete heat island) doesn’t count for much as far as AGW theory is concerned, although it did make for difficult running outside.