I lived in Phoenix and Tucson a long time. I remember going out at MIDNIGHT and having it 90F outside still. LOL I'm very familiar with what you're dealing with. A/C was my best friend.
In Montana it's great. Rarely hit the 100F mark here. The 90's are common at the peak of summer (which is short). But once the sun starts to fall (let alone disappears) temps begin to fall right away. It's awesome!
In the winter, it can easily hit -20F at night. I've always been tempted to find a way to stick my PC outside, and run the DVI and stuff inside to play. LOL Could OC anything at -20F I'm guessing. Just gotta keep the snow from melting into the PC and shorting it out.
The drawback is we often times skip Spring, and go from winter like weather into Summer. And Summer can last maybe 2 months.
If only I had a way to flow outdoor air in through my PC during the winter. Then I could OC my GTX 470.