noun
last summer; summer of last year
Refers to the summer of the previous calendar year. Not used for the most recent summer if it is the current year.
昨年夏、家族と北海道を旅行しました。
Last summer, I traveled to Hokkaido with my family.
昨年夏の猛暑は記録的だった。
The intense heat of last summer was record-breaking.
Means 'this summer' (the current or upcoming summer).
Means 'next summer'.
Compound of 昨年 (last year) and 夏 (summer).