I am growing a small lime from seed, about 2 years since first breaking the soil surface and 18" tall potted in an 8" terracotta pot. I have it in a SW facing window with some additional light from a florescent tube temps are nominally 70 F inside.

Two questions:

At what temp outside do you think I can move the tree back to my balcony into unfiltered sun?

Would it be detrimental to move between the balcony and the window table to sit outside during the warmer day and avoid the cold night?