eli5: why isn’t the summer Solstice the hottest day of the year?

Question

It is the longest day, so it gets the most sunshine, why is it hotter latter in the summer when the days are getting shorter again???

In: 341

Answer 1

Heat input from the sun is the slope of the average temperature, not the temperature itself. so you would see the steepest increase on that day, but the peak avg temp would actually be when the gain/loss from the sun equals out. Yay calculus.

Same reason why hottest time during the day does not occur at noon, but a bit before sunset.