ㄙㄢsānㄈㄨˊㄊㄧㄢtiān

  1. 夏至天氣時候金瓶梅·》:過了卻是六月初一即今三伏天。」

three periods forming the hottest periods of summer, from mid-July to mid-August, namely: 初伏 (mid-July)​, 中伏 (late July to early August)​, 末伏 (mid-August)​
heiße Tage