Originally Posted by RedBaron
What would cause do I get frost in this storage room?
I will just get condensation
I have also checked with humidity with hygrometer, around 45% same as the rest of the house
Frost or "dew", the temperature of that surface is cold enough to condense moisture from the air. It seems the local humidity is higher in that area or the surface is colder.
Posting photos or drawings might provide clues as to, Why this spot?
According to thishttp://www.engineeringtoolbox.com/density-air-d_680.html
moist air rises.
Perhaps a fan will circulate the air enough to stop the problem, and it's easy to try.
If the fan has no effect, that info may also be valuable.