I'm also in Texas, and crazy describes it rather well. But honestly, spring time weather in south Texas is always crazy. It can be nineties and dry, seventies and raining, or forties and misting, all in the space of a week. Heck, last year, a late onset freeze hit in the middle of April and killed off all my mulberry leaves. Being Pakistani mulberries (read tough as nails), they grew back, but that little bit certainly put a strain on my collards, cactus and hibiscus. With all the ground plants, I have a contingency that involves a tarp and a 1 am spray, given that the cool evaporation raises the temperature a degree or two above freezing and the tarp keeps the frost off. But the trees can have some trouble if it gets bad enough. Hopefully, though, it just doesn't get that bad, lest I have to start contemplating building a bigger greenhouse.