My growbed fills and drains every 12 minutes. In the past few weeks we have had some very heavy rain, and a few fronts coming in that have swung the temperatures pretty widely up to low 80s and down to mid 50s, once to mid 30s a couple days ago.
Looks like cold damage. Cut the damaged leaf off.
Were the leaves dry? or like soggy and brown?
I usually cut off old tomato leaves, once the plant reduces life support and prune suckers too. If you don't, you'll have one sorry looking plant.
I agree. Removing the sick ones is a good idea. Plus, check the stems. if it's isolated to certain stems, then prune those. I get soft droopy leaves sometimes when my plants get a little overheated in my greenhouse.