A timely rain moistens all living things — the ancients called it shu.
Tips
history
澍 is literary and not used independently in modern Chinese, surviving chiefly in names. The everyday phrase is 及时雨 ('timely rain'). It also has a reading zhù meaning 'to pour / irrigate'.
register
Classical and literary only — appears in old prose praising seasonable rain and in personal names, not in everyday language.