Answer:
The temperature goes up because when the angle of insolation increases, it means that the sun's rays are becoming more directly focused on that area. That makes it hotter.
For example, the equator is very hot. That's because that's where the sun's rays focus on most directly.
The day is warm, and the night is cold.
Summer is hot all day long if the angle of the sun is direct.
YEARS:
Summer = Direct
Winter = Indirect
Fall/Spring = Half