Which condition is necessary for precipitation to occur?

For precipitation to occur, it is essential that the air becomes saturated with water vapor. When air is saturated, it means that it has reached its maximum capacity to hold water vapor at a specific temperature. This saturation can lead to the formation of condensation nuclei, such as dust or pollen, around which water droplets can cluster. As these droplets grow larger, they eventually become heavy enough to overcome air resistance and fall as precipitation in the form of rain, snow, sleet, or hail.

The other options do not directly contribute to the necessary conditions for precipitation. High temperature and low pressure, for instance, can affect weather patterns, but they do not guarantee saturation of the air. Low humidity and strong winds generally indicate that the air is still capable of holding more moisture, which actually makes precipitation less likely. Stable atmospheric conditions also do not promote vertical air movements needed for cloud formation and subsequent precipitation; instead, unstable conditions are often conducive to the development of clouds and precipitation. Thus, saturation of air with water vapor is indeed the fundamental requirement for precipitation to form.