The stations on the map are uniformely distributed, and the temperature trend is a clear representation of the climate status of the region.
Warming in Ohio is almost nil. While Millport has warmed 2.2º F, most probably due to an "urban heat island effect", Waverly has cooled by 2.0º F - and there is no "urban cool island effect" that we now of. If some cities have warmed, the "heat island effect" most likely had its influence. But if some city cooled, it is because CO2 increases have not the claimed warming effect attributed to it.
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.
Furthermore, 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.