What is the hottest day in summer?

The hottest time in summer is called dog days. "Three volts" refers to the first, middle and last three volts, which is from mid-July to mid-August every year. In the dog days, the ground absorbs less heat than it emits, so the weather is the hottest. The hottest time of the year usually appears in the dog days after the summer solstice. The hottest solar term in a year is summer. The reason why "Big Summer" is extremely hot is that the accumulated heat reaches its peak during the big summer, so it is the hottest in the big summer. Fu Tou and Er Fu have crossed the summer heat, which is the hottest day of the year. Although it is already beginning of autumn in dog days, it is still very hot, so it is also called "autumn tiger". Because the first, second and third days are very hot, there is a saying that "heat is in the third day".