Correct
数伏
/ shǔ fú /
Strokes
Definition
same as 三伏天[sān fú tiān], 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)
Example
As a Verb
begin to be reckoned as the dog days ［the three hottest ten-day periods of the year］