Yes , because clouds contain water and ice crystals. The degree of humidity that the airplane acquires depends on the density of the cloud masses and the speed of the flight – a jet is so fast that the liquid shoots out of its surface.
When passing through a cloud with large droplets, they hit the plane with such force that they leave the windshield soaked and their sound echoes in the cockpit. Aircraft radars detect the size of the droplets so that pilots avoid the thickest clouds , which are sustained by strong, very turbulent air currents.
