The stations on the map are uniformely distributed, and the temperature trend is a clear representation of the climate status of the region.
Texas is yet another state were the cooling has been notorious, putting to shame IPCC's claim that the world is warming. Texas has cooled by 0.48º F in 100 years, at a rate of -0.04º F per decade (-0,02º C)
Inspecting a section of the map we can see there is a wide area where the cooling is predominant; there are a couple of cities showing warming, though. This indicates nothing else that weather stations in those cities have been egulfed by buildings or other structures as airports, affecting their readings. This does not mean, however, that the increase in size of those cities has been a la large one.
Another side on the analysis of temperature graphs and charts is that all of them clearly show the notorious influence of the El Niño - 1998, that had a worldwide effect. However, after that El Niño, temperatures kept going down in a trend that starts about 1940 and kepps fairly constant.
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.