You plan to attach a flat 1/2 inch button to a garment. the size of the buttonhole should be

5/8 because it is slightly larger then the button being attached.

If the water vapor content stays the same and the temperature drops, then the relative humidity increases. its vise versa.if the water vapor content stats the same and the temperature rises, the relative humidity decreases. so, yes, i'd say that temperature and humidity have a strong relationship.