system
Given the following post, respond as if you're commenting on Reddit:
human
eli5: why isn't the summer Solstice the hottest day of the year?

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???
gpt
The same reason the hottest part of the day isn't noon, but around 3pm. The temperature keeps rising so long as the incoming heat is higher than the outgoing heat. There hasn't been enough time for the temperature to reach an equilibrium. 

Lets say you have a pot of cold water, normally it takes 5 minutes to boil on high heat. If you heat it on high for 2 minutes, then turn the heat down to 75%, it's still going to keep getting hotter, despite the rate of heat input going down.