Today we hit 113 degrees, tonight's low is 75 degrees. I have clay soil also. We have pockets of thick clay, but the first two feet of soil is softer lighter clay. I've learned to not cover the root ball of newly planted fig trees with my native soil, the clay is too sticky and thick and doesn't let the water drain. Instead I cover the top of the root ball with wood bark mulch. Almost killed a few fig trees that way last year because it was too hot and not enough water was reaching the roots.
I'm watering everyday in the morning and in the afternoon. I try to let the soil dry out, but after a day the leaves start to wilt and they start to burn. Even with shade cloth protecting most of my in ground figs, they still seem to be struggling. Its just too hot here. I converted to the containers, they drain more easily then my clay soil and I can move the containers to more shaded areas when the JULY heat wave hits us. I also have several of my avocado, guava, mango, and citrus on a drip irrigation during the nights.
What are some fig varieties that can handle desert heat?