Awww I'm sorry to hear that. Good luck with the ones that are left. If it wasn't low for very long, it shouldn't cause any problem.
I have a fairly cheap thermometer with a cord and a probe on the end. Its one of those that you can run out the window to see what the inside and outside temps...
Great! Keep us posted. For alot of folks, that humidity "could" be the cause of the delay. They need to lose enough space inside to be able to get out. And high humidity drags out the process. It depends on alot of factors, so I'm wishing you the best! But don't be surprised if you go another...