Question

on what does the percentage of relative humidity depend

Answer 1

Relative humidity is normally expressed as a percentage; a higher percentage means that the air–water mixture is more humid. At 100%relative humidity, the air is saturated and is at its dewpoint.

Answer 2

Relative humidity is normally expressed as a percentage; a higher percentage means that the air–water mixture is more humid. At 100%relative humidity, the air is saturated and is at its dewpoint.
So the percentage of relative humidity depends on..air water mixture