This is my perspective in using Tempilaq or similar materials (powder too in this case) when they are cold. Simply allow the product to reach room temp before opening the container.
When one opens the ice cold container in a warmer (and presumably more humid - think absolute humidity not relative humidity) environment, that humidity will condense on the container surface AND the open surface of the product. That condensation will then contaminate the contents. That's when most of us, myself included, conclude the damage was due to freezing.
There are other factors too, such as how hygroscopic the product is or evaporation rates and such but the short answer is: Allow the conditions to equalize before opening. I suspect over the years, I've damaged more than one can of powder and other products by my impatience.
Pete