Geographically, average summer temperatures set new records across much of Texas, Oklahoma, and New Mexico and were above or well above average across much of the eastern 2/3 of the United States. In contrast, average summer temperatures were below or well below average in the Pacific Northwest, Nevada, and northern and central California.
Utah straddled this temperature anomaly dipole, with northern Utah coming out near average for the entire summer. This was the result, however, of a relatively cool June, average July, and warm August.
The heat in Texas and Oklahoma was simply incredible, blowing all previous statewide summer temperature records in the contiguous US away.
a preliminary analysis of the contribution of global warming to these anomalously warm temperatures on his Climate Abyss blog. I'm sure this will be the subject of additional analysis in the future.