What is the difference between the beginning of the summer in astronomy and in meteorology?

Weather of Arabia - With the first days of June, the summer season begins in meteorology, but we know that the spring season begins on June 21, so why are there two dates for the beginning of the summer season, and what is the difference between them?

Early summer in meteorology

The summer semester in meteorology begins on June 1 of each year, which is the unofficial start of the summer season, which was determined by the annual temperature cycle and climate patterns.

Meteorologists and climatologists divide the seasons into groups of three months each , based on the similarity of temperatures, and the summer in meteorology includes the three months. June - July - August, because the temperatures are almost the same, and change regularly during those months.

Astronomical beginning of summer

The beginning of the summer astronomically is considered the official beginning of the summer, which is related to the summer solstice and the location of the Earth in relation to the sun, as it is in the northern hemisphere on June 21 (or around), and on this day the Earth's axis is tilted towards the sun, which means an increase Daylight hours are about night hours.

Why are meteorology classes scheduled for different start dates?

Determining dates for the four seasons in meteorology was due to the difference in length from 89 to 93 days in the duration of the seasons, and it was difficult for experts to compare statistics from year to year, and weather and meteorology remains important in studying the beginnings of the seasons depending on the average temperature Annual events, due to its proximity to what is actually happening on the ground, and this is of great importance to different sectors such as the agricultural sector, the industrial sector, and others.