The first day you have to scrape your windshield before driving in the morning really makes you realize that summer is out the door and winter is nipping (and nippy) at its heels.
It seems the mood of people changes as well. They are tight lipped, shoulders drwn about their ears, less smiley. No matter how much some people try to deny it, we are children of the Earth, and we can not ignore the effect it has on us.