More important, it is easiest to notice during the night. In most non-desert areas, and especially near costs, evenings are calmer than days. Without wind, the scent of jasmine lingers nearer the plant for longer, so it's easier to notice. Since nighttime temperatures are lower, the air is more heavily laden with moisture. The temperature at night often goes below the dewpoint, and dew, mist, and fog can result.
Most people can detect scents better in wet air.
I don't know why, but if you do, tell me . Jasmine blooms in March where I live. When I am out at night on a bicycle or on foot I can tell when I am passing a house with jasmine growing. During the day, other spring scents, like wisteria and orange blossoms, are stronger than jasmine. Jasmine is in the olive family.