Old saying is used to express the lesson and satire for the effective expression.
Morning glory has a short good time.
This is a metaphor of short-lived transient matter. The morning glory comes out in July-August with trumpet shaped flower.
Morning rainbow brings about rain, evening rainbow means fine weather.
In Japan, the weather changes from the west to the east. This phrase is used as the weather judgment.
When frogs are croaking, the rain will come soon.
Children are requested to stop playing to go home.
Japanese summer style houses with the verandas (“Engawa”) are good in the hot weather and the veranda namesake, fin area of a flatfish is a Japanese delicacy.
“Kosode” in Summer Time
"Kosode" is a winter Kimono with tight sleeves. So this is a metaphor for unnecessary things.