not knowledgeable enough about SFoT operations to say, but at Fiesta Texas yesterday, it was in the 40's, and Superman (B&M Floorless), and Poltergiest (Premier LIM launch) never opened. And when it dropped down closer to 40, they closed Goliath (B&M inverted) and Batman (S&S FreeSpin).
however, the Arrow minetrain, RMC Iron Rattler, and Vekoma Boomerang stayed open. (not sure about the spinning coaster, we were on the other side of the park from it).
so that might help?
I hope Over Texas keeps Shockwave, Titan and NTG opened as those 3 are the ones I'm looking forward to the most!