Mike,
As I've gotten older, I've gotten more sensitive to change of the seasons. Spring to summer. Winter to spring.
In other words, I can FEEL the sun's angle changing it seems. The air may be different for the calendar, but it is there.
Not long after the summer solstice, I sense the weather changing.
Maybe it's somewhat psychological, but I think not.
Fall is coming fast. Time is speeding up.
Can't you feel it?