Worst I expect is high 30's/low 40's at night and 70's during the best days.
Can I just warn you that they don't yet have enough fat stores or seasonally induced winter down. They should still be kept at about 80* right now and decreasing 5* per week until they hit 70*
IMHO they are not ready for 40* temps.

Edit, Ok never mind. I just saw your other post on the subject. Maybe if I lived where you do,I would try that but temps here are just so erratic, I'd be worrying all the time!
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