lorax

I'd say dryness is your factor here. We can grow Cavendish and Rojo in the high-altitude deserts here, where temps often pass the high 40's (Centigrade) but it's so water intensive that most people don't do it. I'm talking about going out to water your nanners twice daily on days over 30. Oddly enough, Plantains (big mother green cooking nanners) grow just fine, if you observe the practice of watering once daily and take into account my next point.

You'll want to investigate fairly robust wind screening for any nanners you plant. In the deserts here it's often not the lack of humidity (and we can go down to a punishing 20%) that kills the pups, but being literally blown away - the leaves get shredded down to rags and the plant expires. With a wind-break the plants have a better chance of retaining their own moisture.