The affects of cold weather has on pools can been severe during a hard freeze. If a pool has cracks, they may not leak during the summer and warm water. But when temperatures drop the cracks can expand and cause leaks.
If you are not adding water to your pool (other than normal use) and you close and winterize it, then in the spring you take the cover off and the water level is low, this is a indication that the structure has been compromised and it may be time to have the pool inspected.
