Arab weather - astronomical calculations indicate that the date of the autumnal equinox for this year falls on Friday, September 23, at 05:03 am (Jordan time) in the northern hemisphere, where the sun is perpendicular to the equator and is equal on this day All night and day.
The sun rises on the autumnal equinox for this year in the capital, Amman, at 6:24 a.m. from the true east point, which makes an angle of 90 degrees with the horizon, and sets at 06:31 p.m. from the true sunset point at an angle of 270 degrees, meaning that in this Today, the exact direction to the east and west can be determined. The length of the day is 12 hours and 7 minutes, while the night lasts 11 hours and 53 minutes.
This fall lasts astronomically for 89 days, 20 hours and 44 minutes, until December 21, the day of the winter solstice and the first day of winter. As for the beginning of the fall semester in meteorology, it begins with the beginning of September and ends with the end of November of the same year.
Starting from the autumnal equinox, daylight hours gradually decrease in the northern hemisphere, as a result of the sun's gradual movement towards the south, which leads to a decrease in the amount of solar radiation that reaches our region, and thus temperatures tend to gradually decrease.
Autumn usually witnesses multiple types of weather ranging from dry and warm to relatively hot and hot, and sometimes rainy and cold weather as a result of the region and the Kingdom being affected by weather systems, such as: the extension of the Red Sea depression, and air depressions accompanied by cold and warm fronts.
The Jordanian Climatic Record in the Meteorological Department indicates that the Amman Civil Airport monitoring station, and since 1921, witnessed in the previous autumn seasons 36 heat waves, the longest of which was in the year 2020, which lasted 8 days between (3-10) September, during which the capital (Amman Airport) recorded Al-Madani) reported a maximum temperature of (43.0), an increase of 11 degrees Celsius over its general average for the same day, according to the Jordanian Meteorological Authority.
Climatic records also indicate that some regions of the Kingdom may be exposed to frost formation in late autumn.
The average maximum temperature at Amman Civil Airport during the autumn season (September, October, November) is 26.3, while the average minimum temperature is 14.8, and the highest maximum temperature in Amman during the autumn season was 43.0 on (3-9 -2020), while the lowest minimum temperature was recorded on (11-24-1958) and it reached 3.2 degrees Celsius below zero, according to the Jordanian meteorological department.
At the level of the Kingdom, the Deir Alla monitoring station recorded the highest recorded maximum temperature in the fall season, reaching 50.1 on (4-9-2020), while the Shoubak monitoring station recorded the lowest minimum temperature recorded during the autumn months, which amounted to 11.2 degrees Celsius below zero degrees Celsius. And that in (17-11-1978).
Studies in the Meteorological Department indicate that the average temperature in the fall of 2020 was the highest in the past 100 years, with an increase of about 3 degrees Celsius over its general average.
The average total amount of rain during the autumn months (September, October, and November) in Amman usually constitutes 11% of its general seasonal average, and the highest daily amount of rain recorded at the Amman Civil Airport monitoring station was 79.4 mm in 1938, while the station recorded Sweileh recorded the highest daily amount of rain in the Kingdom, which amounted to 100.5 mm in 1986.
It is noteworthy that the Kingdom witnessed in the years 1982, 1904, and 2004, snowfall during the autumn season, which was in the last third of November.
The Kingdom also witnessed a snow storm on December 10-15, 2013, before the winter solstice, during which the Shoubak monitoring station recorded the lowest minimum temperature in the climatic record at the level of the Kingdom, reaching 16.0 degrees below zero Celsius on (15/12/2013). .
Read also: What distinguishes the day of the autumnal equinox from the rest of the year?
Read also: Why does the disease increase when the seasons change?
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