The stations on the map are uniformely distributed, and the temperature trend is a clear representation of the climate status of the region.
Louisiana has cooled a lot, in spite of all that hot Tabasco sauce they produce. It seems that the warming happened in New Orleans comes from all those fantastic Hot Jazz "jam sessions", down in Basin Street.
Seriously now, New Orleans is a clear example of a "Urban Heat Island", surrounded by cooling neighbors. Again, no warming at all in the Southern USA. 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.