What effects causes frost to form inside of windows?
Frost is related to condensation, so for the most part I will be reffering to condensation. But condensation forms on the outside of a cold object when the air around it is relatively humid. When air gets colder it cannot hold as much water vapor in it, so the air which is cold from the cold object has excess water in it that it needs to get rid of, depositing it somewhere, most likely the cold object. Frost is formed when the condensation freezes.
