The phrase "happy is the corpse the rain falls on" is a traditional superstition, particularly associated with British and Irish folklore, where rain at a funeral is interpreted as a positive omen.
It is believed to signify that the deceased is blessed, and their soul has been released from purgatory and ascended to heaven.
This saying is often paired with "happy is the bride that the sun shines on," forming a well-known couplet that reflects the idea that favorable weather during significant life events brings good fortune