Why is the summer solstice not the hottest solar term?

When the sun shines vertically or nearly vertically, the ground receives more light and heat, and the climate will be hot; When the sun shines obliquely, it receives less light and heat, and the climate will be cold. Summer is coming, the position of the sun is getting higher and higher, the heat received by the ground is gradually increasing, and the heat released is also gradually increasing. When it reaches the summer solstice, it receives the most heat, but it takes about 1 month to reach the maximum, so the hottest weather does not appear in the summer solstice, but after the summer solstice about 1 month.