Why don’t all clouds produce rain?

‘Water vapor’ is always present in the air. When the temperature reduces, the water vapor condenses into tiny droplets of water. Now we say that the air is ‘saturated’. When this saturated warm air rises to an altitude where the temperature is lower, more condensation takes place and we have ‘cloud’ made of closely packed water molecules to form countless droplets. Due to the gravitational pull of the Earth, the clouds start to sink lower and lower. Mostly, when they fall they reach a warmer layer of air. This causes the water to reach a moistened and cool air. Therefore, because of more condensation, the tiny droplets become and bigger and bigger until they become so heavy that they fall to the ground in the form of ‘rain’. If the air is very, very cold, we have snowfall. Nonetheless, the water in clouds constantly changes back and forth from vapor and liquid. And that is why clouds keep shape shifting!