Cold is a lower temperature than we expected on that location at that time. Again, our expectation is the problem.
Lack of warmth blocks plants from growing properly. Everything slows down when temperature goes down. Just look at mountains, the higher, the colder. Above a certain height nothing grows. Rebearth extends boundary’s and helps growing plants in colder environments. Suitability is improved by Rebearth.
In greenhouses heating may be down a few degrees. Rebearth can help plants to grow as you are used to, only in a colder environment, taking less energy for heating.