summer; CL:個|个[ge4]
夏 · 10 strokes
Pictograph of a person, represented by their head (頁) and feet (夂), being heated underneath the sun (日). The sun component was later omitted for brevity during the Warring States period.
天 · 4 strokes
Depicts a person (大) with an emphasized head. Based on the original meaning "head". The meaning later shifted to "top", "high", and "sky".