Moisture from warmer outside air will inevitably find its way into the building through natural leakage and door traffic. This usually results in an increase in relative humidity and dewpoint of the cool ice rink air.
When the humid air comes into contact with colder surfaces (eg: steel roof supports), the air can easily reach its dewpoint (saturation point) and condensation will occur. Dripping water will cause damage to the ice by pitting the surface or by forming “ice mushrooms”, thereby lowering its overall quality.
If humidity is allowed to rise, indoor fog can be a common problem, especially in Summer when the dewpoint of outside air (and hence moisture loads) are at a maximum.