What is the difference between the beginning of summer in meteorology and its astronomical start?

Weather of Arabia - Summer starts according to meteorology and astronomical in June of each year; The first starts on the first of June, and astronomer begins on the 20, 21, and 22 of June.

But what is the difference between the two beginnings, and why did scientists and specialists invent a different start from the astronomical beginning that has been known for decades.

What is the difference between the beginning of astronomical summer and according to meteorology?

The beginning of the summer depends on an astronomical calendar, while the other depends on the meteorological calendar.

The beginning of the summer astronomically

Dependence is determined in determining the beginning and end of the astronomical point of view on the Earth's position in relation to the sun, which changes throughout the year, which results in two equinoxes (autumn and spring) and two coups (winter and summer).

The summer begins astronomically, with the summer solstice occurring each year which is 20, 21-22 June each year, when the sun is at its highest altitude at noon above the horizon. It is perpendicular to the orbit of the cancer, which is the latitude 3 and 23 degrees north of the equator. It is the beginning of the astronomical summer and lasts for 95 days.

Early summer according to meteorology

Meteorologists resorted to choosing a different beginning and end for the summer and all seasons of the astronomical start, for several reasons, including: Facilitating the archiving process for the months, since computers were difficult in the past to separate the first 20 days of June from the days remaining at the end In terms of weather data, data entryers took the summer information starting on the first day of June, more reasons from here