a cold day in July

a cold day in July

A time or event that seems unlikely or will never come to pass. It refers to the fact that the weather is usually very hot in July. It'll be a cold day in July before they get that new interstate built.
See also: cold, July
Farlex Dictionary of Idioms.
See also:
  • July
  • it'll be a frosty Friday
  • be set fair
  • it'll be a cold day in hell
  • be second nature
  • take the Browns to the Super Bowl
  • frizz up
  • a knock-down, drag-out fight
  • a rotten apple spoils the (whole) bunch
  • a rotten apple spoils the (whole) bushel