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The Southwest, southern Arizona in particular has had a definite climatic change over the last 50 years or so, when I was growing up in Phoenix. It's wetter and cooler, but not less comfortable, as it comes with more humidity.
Temperatures approaching 120oF were not uncommon in late June, and rain? Forget about it. The monsoons in August were dust storms with occasionally enough rain to make a mess. The Salt River never saw water, and was safe make-out area for ASU students.
When was the last time that you saw the relative humidity in the sinlge digits?

I agree. I remember, "way back when," my kin in Phoenix bitching when the humidity got up to 10%, saying it was "humid." And those dust storm "monsoons" were indeed the norm. More recently (~96), I was up around the Utah / Arizona border one October and witnessed a blizzard, one that apparently made it down past Sedona, perhaps even to Prescott. I'd expect that in mid winter but not October. Global warming? Ptschaw! Yeah, right!

Actually rainfall here and humidity here is down, especially in the mid zones, the east side is still getting plenty of rain). It's cooler but dryer (we've noticed things wetting up in Phoenix, our water table went up for the first time in a few decades, normally Phoenix causes a suck which makes the water table in this area one of the few that runs uphill). Still keeping solid desert humidity (you know, complaining when it gets up over 10, complaining a lot when it hits 20... being a transplanted Chicago boy I laugh at myself when I do that), we just aren't getting the highs, either the spikes or the sustains (right around the 117 year we also did 100 consecutive days over 100, now it won't stay that high more than 2 weeks in a row).

Weather has always been interesting to me, started when I walked all over learning to observe the weather was a survival skill. One thing I have learned for sure about weather is that if you want to predict the weather next year you need at least 4 year's data, and that ratio seems to hold. Simply put we just don't have the data available to have any clue what the weather is going to be like in 2102. Just gotta ride it out, one of the big strengths of human beings is that we're adaptable, when the time comes we'll be ready one way or the other.