Which term refers to the temperature at which water vapor in the air must be cooled for condensation to occur?

The term that refers to the temperature at which water vapor in the air must be cooled for condensation to occur is the dew point. The dew point is crucial in meteorology and climatology as it indicates the moisture content of the air. When the air temperature drops to the dew point, the moisture in the air can no longer remain in vapor form and begins to condense into liquid water, forming dew, fog, or clouds. Understanding the dew point helps in forecasting weather conditions, as it directly relates to humidity levels and the likelihood of precipitation in an area.

Freezing point is the temperature at which water changes from a liquid to a solid, which is not related to the condensation of water vapor. Humidity level indicates the amount of moisture in the air but does not refer specifically to the temperature at which condensation occurs. Precipitation threshold relates to the amount of moisture necessary for precipitation to happen, rather than the temperature at which condensation begins.