Ideal vs. ok vs. bad temps to set transplants

[Solanum315]

For now I’d just like to focus on the cold end of the spectrum since I’m a New Yorker. In a perfect world, what night time temps would you like to see to set tomatoes? What is acceptable and at what point is it simply a bad idea due to creating dormancy that will set your plants way behind? It seems to be an unusually cool May this year...