LOL, yup...
I think it is poetically fitting as a violent disapproval for summer... Pretty significant failure ( being silly here of course...), then underscored by +20C 850s being well mixed, after Met summer officially ends. haha.
But more seriously though, there's some use to defining 'when the corner is turned' so to speak. And it's not so much the scaler value of the temperature, but it's really more like a whole appeal. This air mass is in fact this cool because the hemispehre is tipping away. A month ago, this is 7 warmer ...so to speak.