plum rains

noun[usually plural]1

1. •
   Also occasionally in the singular form plum rain: the East Asian rainy season from early summer to midsummer in the fourth and fifth lunar months (early June to early or mid-July); also, the rain which falls during this season.

   • The heroes of those thousand years? / Alas! like running water, gone; / Yet still the fever-blast one hears, / And still the plum-rain patters on. — 1894