cool summer; cold summer; cooler-than-normal summer
Refers to a summer with unusually low temperatures, often discussed in weather, farming, crop-yield, or economic contexts.
今年は冷夏で、米の収穫量が減った。
This year had a cool summer, and the rice harvest decreased.
冷夏の影響で野菜の価格が上がった。
Vegetable prices rose because of the cool summer.
This year is expected to have an unusually cool summer.
Vegetable prices rose due to the cool summer.