Not necessarily! A solar farm in Texas verses a solar farm in Florida does not compare.

It's not the temperature it reaches so much as the temperature it differentiates from its surrounding area that will trigger a thermal. In Texas, especially Uvalde, the soil is dry and typically very hot. Quite the opposite in Florida, where it's much greener and wet. If that solar farm is surrounded by forest, crops or wetlands, then it would absolutely produce a sufficient thermal.