Well, a follow-up now that season in which cooling is needed is basically over in the Salt Lake valley. Again, the swamp cooler did fine this summer. Regarding the monsoon, this years seemed to fall into the pattern I remember. There were about a total of 2-3 days when the humidity rose enough to severely hinder the swamp coolers ability to cool.
A couple weeks ago I was up in the morning and the news anchors were commenting on how "muggy" the weather was. The dewpoint was up to about 60