Is relative humidity, in general, highest in the afternoon or the morning?

Question

BlackTom AI · Accepted Answer

Question restatement: Is relative humidity, in general, highest in the afternoon or the morning?

Option a: Morning. This choice is generally correct because relative humidity (RH) depends on the ratio of actual water vapor present to the maximum amount the air can hold at a given temperature. In the cooler morning hours, air temperature is low, which lowers the saturation vapor pressure. If the actual vapor pressure remains relatively constant or does not decrease as much, the RH tends to be higher in the morning. Additionally, morning often features cooler, still air with less solar heating, promoting higher RH and sometimes visible dew.

Option b: Afternoon. This choice is typically less accurate in many climates. During the afternoon, temperatures are higher, which raises the saturation vapor pressure of the air. If the amount of moisture in the air doesn't increase proportionally, the relative humidity decreases. While humidity can rise in some humid climates due to air movement or rain events, the general tendency in many regions is for RH to be lower in the afternoon than in the morning because of the temperature rise.

Summary of why the morning option is favored: cooler temperatures reduce the air's capacity to hold water vapor, so the same or similar moisture content yields a higher RH in the morning. The afternoon’s warmth increases capacity, often lowering RH even if absolute humidity is unchanged. Therefore, option a aligns with the typical diurnal pattern of relative humidity, while option b describes conditions that are less common for highest RH.

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Is relative humidity, in general, highest in the afternoon or the morning?

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