RH
RH means relative humidity: the amount of water vapor in air expressed as a percentage of the amount the air could hold at that temperature. It affects water loss from mango leaves, drying of flower clusters, and moisture loss from harvested fruit. High RH does not necessarily mean surfaces are wet, but condensation or prolonged leaf wetness can favor disease. Consider temperature, ventilation, and actual surface moisture together rather than using one humidity reading as a disease diagnosis.