Does solder crack below some temperature?
The issue isn't typically low temperature, it is the temperature cycling between hot/cold. This causes a thermal stress crack in some solder joints.

This means that there isn't a "lower bound" at which the solder will crack, but it depends on how hot the joint gets during operation, then cycling back down. For example if you have a circuit inside the engine compartment of a car, you could go from 0°C to ~80°C pretty quick, and then back again as the car speeds up and slows down or stops. These thermal stresses cause cracking.