morning chill (of a summer day)
Archaic noun referring to the coolness felt in the early morning during summer. Not used in modern everyday speech; found in classical literature or poetry.
While feeling the morning coolness, I have breakfast on the veranda.
Compound of 朝 (あさ, 'morning') and 涼 (すず, 'coolness'). The exact historical derivation is uncertain, but the term is attested in classical Japanese texts.