계절 - Season
"Season" is a catch-all term for different periods of the year.
봄 - Spring
When spring comes around, there is an explosion (bomb) of color.
여름 - Summer
When summer comes along, it gets too hot to leave your room.
가을 - Fall
Leaves have a lot of gall to cover my yard in the fall.
겨울 - Winter
It is very cold in winter.
Edit: Corrected the misspelling of 겨울! My bad~
Edit again: Corrected misspelling in drawing of 여름. #ihadonejob