Let’s break down the two main calendars: and meteorological autumn . The Meteorological Autumn (The Simpler Answer) For weather records and climate statistics, meteorologists divide the year into neat, three-month seasons based on temperature cycles. This method makes it easier to compare monthly climate data.
According to this system in the (North America, Europe, and Asia):
The Astronomical Autumn (Based on the Sun) This definition is based on the Earth’s orbit around the sun and the equinoxes. It is the traditional calendar most school textbooks use.