Some observational studies have suggested that the two phenomena of entrainment-mixing and droplet clustering are likely related to each other; however, their quantitative relationship remains elusive. In this study, we first present a theoretical power-law expression that relates the transitional scale number used to measure entrainment-mixing to the Stokes number used to study droplet clustering. Measurements collected during the ACE-ENA campaign are then analyzed to validate the theoretical expression. Further analysis is conducted to physically understand the scatter of the observational relationships as a function of entrained dry air relative humidity. Important implications for further addressing the two phenomena together are explored as well.