How can one determine the relative humidity on a particular day at a given place?

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Q: 16 (CDS-I/2024)
How can one determine the relative humidity on a particular day at a given place?

question_subject: 

Science

question_exam: 

CDS-I

Relative humidity requires both temperature and absolute humidity for calculation. It represents the ratio of current absolute humidity to the highest possible absolute humidity at that temperature.