The rainy season in the Kingdom of Saudi Arabia, locally known as al-Wasm, begins around mid-October each year and lasts about fifty-two days.
As the rainy season begins in the Kingdom, temperatures gradually begin to drop, with a marked variation between day and night. The onset of the rainy fall heralds the growth of certain flora species, such as lavender. The rainy season has been labeled al-Wasm (the marking) because rainfall marks the land with greenery.
Non-native bird species are observed in some regions of the Kingdom during the rainy season, as they take short breaks during their winter migration. The most notable signs of the rainy season are the gradual decrease in daylight hours, prolonged nighttime, and a temperate climate.
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