In most places in the world, the solstices and equinoxes are the dividing point, therefore today is the first day of autumn. To be more exact:
|March 20 at 18:26 UTC||Vernal (Spring) equinox||Autumnal equinox|
|June 21 at 12:26 UTC||Summer solstice||Winter solstice|
|September 22 at 04:03 UTC||Autumnal equinox||Vernal (Spring) equinox|
|December 21 at 00:22 UTC||Winter solstice||Summer solstice|
In the UK, It’s generally held that September to November is autumn and so on throughout the year. That makes it September 1st for the start of autumn. Weatherwise, it makes sense although it does seem that the seasons are about month late these days. You could point to our October snow in the past few years as negating that but if you accept that “lateness”, then that puts the change of season aboput at the equinoxes and solstices.
December’s the issue in my eyes. Who thinks of December as autumn? With Christmas upon us and all the mince pies and mulled wine, it seems very winterish to me. How do you see it?