The start of fall varies depending on the location of the hemisphere. The transition date for the start of fall is called the equinox, a period when both hemispheres receive the same amount of sunlight, and the length of the day is the same as the night. In the case of the Southern Hemisphere, autumn begins between March 20 and 21 and ends between June 20 and 21. In the Northern Hemisphere, autumn begins between September 22 and 23 and ends between December 21 and 22. The end of fall in both hemispheres is followed by the beginning of winter.
Characteristics of autumn
The main characteristics of autumn are the gradual decrease in temperatures and rainfall. In this way, it represents a transitional season between summer, which is hot and rainy, and winter, which is cold and dry. This scenario is a generalization, since the intensity of this transition will vary according to the climatic typologies of each region of the globe.
In addition, during the fall, the days are shorter than the nights due to the movement of translation and the tilt of the Earth's axis. These shorter days and longer nights tend to become even more noticeable as winter approaches. In the fall, there is also a greater presence of cold, dry air masses and a greater likelihood of fog.
In addition, the relative humidity of the air is lower, as there is less moisture produced by the rainfall. During this season, vegetation tends to lose its leaves, especially in subtropical and temperate climates - since there is less water available for plants and the loss of leaves helps plant species preserve their water reserves, preventing evapotranspiration.
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Source: preparaenem.com