The stations on the map are uniformely distributed, and the temperature trend is a clear representation of the climate status of the region.
Illinois has cooled, by all means - and it keeps doing it. From 36 stations records, only 13 show a slight warming, mostly due to the Urban Heat Island effect.
Global warming means there is an overall warming everywhere in the world, but there must be a reason for the cooling in some regions - reason that has not been explained by any climate model. As CO2 is blamed for the temperature increase and as CO2 has increased steadily, there shouldn't be any cooling anywhere. As we see cooling in many places around the world, the relation between CO2 and temperature increase is a false one.
as the relation between CO2 and temperature is derived from computer models,
these climatic models are not an accurate image of the climatic system, and
they cannot give an accurate prediction of the future climate.