It hold up very well in hot and humid weather condition.
We are using Buttercream for our Cream cake.
Our Fondant covered cake Or Cream cake does NOT need to be refrigerated. Just keep it in a cool dry place or best to place it in an air conditioned (low humidity) environment
Storing a Fondant covered cake or the cream cake with decorated Fondant figurines in a refrigerator will actually create condensation from forming, as soon as you remove the cake from the refrigerator
Sample Pic of Cream Cake:
Sample Pic of Fondant Cake