Is summer the hottest time of the year?

The summer solar term is the hottest solar term in a year. The ancient book "Twenty-four solar terms" said: "It is extremely hot in the summer." This is enough to explain the fiery degree of this solar term. The reason why it is extremely hot during the "Great Summer" is that since the beginning of summer, the heat absorbed from the ground sun during the day is more than that emitted at night, and the heat keeps accumulating. During summer, accumulated heat reaches its peak, so summer is the hottest.