Global warming or not the suns rays are going to be consistent. The air temps will be up in some areas and down in others.
The southwest is in the midst of a very long term drought that started about 10 years ago. Paleoclimitologists have determined that super droughts that have nothing to do with global warming occur in the southwest every few hundred years and last 10-30 years. The Anazasi indians were wiped out due to a drastic change in climate in the 11th century according to some theories. If the climate scientists are right, and I believe they are, the natural cycle will be exacerbated by global warming but there will be anomalies around the globe. In the US the southwest and midwest will suffer and Europe will get significantly colder and might enter another ice age.
In the midwest it is still not as hot or dry as it was in the 30s ( I was not born yet), 50s or 80s. The summer in the midwest is quite tolerable and while we have had some hot days it has been generally quite pleasant. That neither proves or disproves global warming.
Bill