What's the difference between a little summer heat and a big summer heat? Which is hotter?

There is a folk saying that "it's a little summer, and it's steamed and cooked." In contrast, it is hotter in summer. "Summer heat" means heat, and light summer heat means that the weather is getting hot, but it is not the hottest time yet. Summer solar terms are just around the middle of the "dog days", which is the hottest, wettest and sultry day of the year. The reason why it is the hottest in dog days is that the surface humidity becomes higher after dog days, and more heat is absorbed and less heat is emitted every day.