According to Leha health inquiry, the dog days are between light summer heat and heavy summer heat, which is a hot and humid season of the year, from the middle and late July to the early August of the solar calendar, that is, midsummer. Although the temperature will drop slowly after three days, there is still a certain time before the end of summer, so it will still be hot after three days.

Dog days refer to the time when the temperature is the highest and it is humid and sultry in a year. The dog days can be divided into three days: the beginning, the middle and the end, and their dates are determined by the solar terms of the dry calendar and the dates of the dry calendar. The dog days appear between the summer solar terms and the summer solar terms among the 24 solar terms, and generally appear from mid-July to mid-August in the solar calendar.