summer and winter

buy straw hats in winter

Of stocks, to buy when both demand and price are low, so as to sell when demand and price are high.

dead of winter

The middle of the winter, characterized by being particularly cold.

high summer

The hottest part of the summer.

sweet summer child

Someone who is naive, or who has never experienced hardship.

winter rat

An old, unattractive automobile, purchased for little money, to be driven during brutal Great Lakes winters while the owner's "good" car remains garaged and protected from corrosive road salt for the season.

winter wonderland

A beautiful scene of snow and ice.