July Temperature Breakdown
The slow start to monsoon activity has a connection to the persistent heat that has built and lingered across the US Southwest for much of the first few weeks of July (Fig. 1). The building ridge and dome of high pressure had the effect of boosting daily temperatures and preventing optimal flow of moisture into the region, not to mention missing out on the cooling effects of monsoon precipitation activity, no matter how irregular.
The period of July 10-13 were especially hot across much of the region (Figs. 2-3), with numerous record warm daily high temperatures, as well as a smattering of record warm overnight lows.
Figure 1 - CLIMAS: Climate Assessment for the Southwest
Figures 2-3 - National Weather Service