These are two things I noticed recently, especially tonight, about the evenings we are having. They may be unimportant, but for me (and maybe for you too) they are:
1)The evenings are cooler. I mean I know they should always be, but the difference is noticeable.
2)The sun goes down earlier. Again, it might sound like I am stating the obvious, but now it is somewhat more noticeable. The emphasis on the somewhat.
And that makes me happy, I love how transient summertime appears to be these days.