Merita, It is hard to tell, but photo 1 the top leaf looks similar to sunburn, and the under leaf looks more like cold water damage. If cold temperatures were the only culprit here, I believe that the flowers would bare the brunt of the damage and they look pretty good. Once again it is hard to tell from just the one picture.
The second photo is hard to tell what is going on there too. Is it shadow or is it damage on the leaf? That bud should tell you if it was cold damage or not. If it blasts then probably cold, if not probably something else. Cattleyas usually can take fairly chilly temperatures. Lower 40s they should be good, maybe even upper 30s, you maybe OK if the plant is healthy and mature.
The third photo, I don’t know if that is cold damage, looks more like one of the leaf spot funguses. But again it is hard to to tell from one photo. I would ask others in your area or at your local society, if they have had similar damage on their cattleyas due to Cold temperatures. All of these plants look as if they will be mildly effected by this and should recover. Make sure to watch for bacterial or fungal out breaks in these damaged areas in the next few weeks.
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