summer
夏 centers on the season of summer, the warmest time of year.
夏 originally depicted a person with a mask or headdress, possibly representing a ritual dancer, and later came to mean summer. The modern form is simplified, and the exact historical development is uncertain.
The top part looks like a sun hat, and the bottom 夂 suggests walking slowly in the heat. Picture someone wearing a hat and trudging through the hot summer day.
For カ, imagine a car overheating in the summer sun: car -> カ, and the summer heat makes the engine steam.
summer
summer vacation; summer holiday
middle of summer; height of summer; midsummer
summertime; summer season
summer season; summer; summertime
early summer
summer term (e.g. school); summer period
this summer; next summer; last summer
spring, summer, autumn (fall) and winter; the four seasons
suffering from summer heat; summer heat fatigue
summer clothes; summer wear; summer uniform
summer solstice
hyuganatsu (species of citrus, Citrus tamurana)
summer fields
summer clothing; summer wear
everlasting summer
daylight saving time; daylight savings time; summer time
first day of summer (approx. May 6)
Summer Tournament (held in Tokyo in May)
next summer