牛毛细雨

Explanation: Refers to the very fine rain 　　Usage: Partial official; as subject, object; for the description of rain 　　Source: Leong Ching Wang, "Um autumn two essays as" Volume V: "ox hair get sun light rain." 　　Examples: But the grievances ~, vacantly misty, but no trace of the sun. ★ Tao Cheng, "my family" four Thesaurus:  Inclined drizzle, air flurry