五黄六月

Explanation: Refers to the lunar calendar May and June, when the hottest weather. 　　Usage: Joint type; as subject, attribute; that when the weather is hot 　　Source: Ming Wu Cheng-en, "Journey to the West" Twelfth seven times in June only five yellow, no handle, parents and the elderly, so the person to send. " 　　Examples: If I remarry wife and children in Nanjing, ~ harm me dead. (Ming Feng Meng "Jingshitongyan" Twelve Volume IV)