Macbook pro low temperature tolerance
I just looked at the user manual for my Macbook Pro (mid-2012), and discovered this info:

Storage Temperature: 


-4 to 113 degrees Fahrenheit


Operating Temperature:


50 to 95 degrees Fahrenheit


According to the storage temperature, it looks like your -5 F is calling it a little too close.

This appears to be an online copy of the user manual I have.

Look here for more manuals.