[Morgan.]

The 22nd is the official start of Autumn

[Christmas Dynasnow]

Originally Posted by Morgan.

The 22nd is the official start of Autumn

No it is not. Meteorological Autumn starts today. WHat you are referring to is Astronomical autumn.

To use the astronomical "seasons" you end up with the 20th of December still being autumn and that is nonsense

Meteorological autumn

Meteorological seasons consist of splitting the seasons into four periods made up of three months each. These seasons are split to coincide with our Gregorian calendar, making it easier for meteorological observing and forecasting to compare seasonal and monthly statistics. By the meteorological calendar, the first day of autumn is always 1 September; ending on 30 November.

The seasons are defined as spring (March, April, May), summer (June, July, August), autumn (September, October, November) and winter (December, January, February).