four seasons, namely: spring 春[chun1], summer 夏[xia4], autumn 秋[qiu1]
四 · 5 strokes
In ancient texts the character 亖 (four horizontal strokes) was used. The current form 四 depicts breathing through the nose and is the original form of 呬. The use of 四 as a number is a phonetic loan.
季 · 8 strokes
禾 represents short stalks of grain, 子 represents a young child. Based on the original meaning "youngest, small grains". The meaning later shifted to "crops", and "season".