The effect of relative humidity of surrounding atmosphere on capillary adhesion has been analysed taking into account various theoretical models of adhesion process and different contact configurations between adjacent surfaces. It has been shown that for configuration systems including a spherical particle, there is no agreement between models predictions and experimental results both for values and trends of adhesion forces. A proper trend can be obtained from the models for a solid cone-fat surface system, but adhesion force values calculated for a single contact point are too low. More accurate model calculations require a contact point number function to be included in the models due to roughness of real surfaces. The function can be obtained from surface engineering data.