In the last scene of the movie "A Clockwork Orange" By Stanley Kubrick,
Fred: Do you understand, Alex? Have I made myself clear?
Alex: As an unmuddied lake, Fred. As clear as an azure sky of deepest summer. You can rely on me, Fred.
I just want to know why the word deepest is used to denote summer? generally summer is hot, may be the question is on use of word in proper sense related. I shall be happy if someone just make me understand that why the word deepest is used to signify summer. I am not good in English!