Hail is formed of Rain, congealed into Ice: and Snow of the same Humour grown together, but not so hard. Frost is made of Dew frozen. In Winter Snows fall, and not Hail. It haileth oftener in the Daytime than in the Night; yet Hail sooner melteth by far than Snow.
Pliny's Natural History. In Thirty-seven Books, Book II, Chapter LX (p. 98), Printed for the Club by G. Barclay. 1847-1849