Observing Shadow Patterns

How can the sun tell you the season? 

1. Picture 1
2. Picture 2
3. Picture 3
4. Picture 4
5. Picture 5

1. Since it's 7:30pm in the picture in the day time then I assume that the season is Summer. The boy is also wearing Summer clothes. 
2. I think its Fall because there are pumpkins, there's fog in the morning, and its not very light out side at 7:15am. That is why I think it is Fall.
3. I think its Winter because its 4:30pm and the sun is already setting, there is no leaves on the trees, and there is also so much snow.
4. I think its the start of spring because there is still snow in the background but flowers are starting to bloom. Snow is also starting to melt. The sun is also up and its only 7am which during Winter at 7am it would still be dark so thats why I think its the start of Spring.
5. I think its Winter because its 12:30pm and the shadow is long, at summer the shadow would be short. The grass is also not green in the Winter so that explains it.