night. In the case of cloudy days, the upper layer may be heated rather than the ground during the day, and at night, the clouds trap the heat of the lower layer while the upper layer cools, so convection develops. In fact, considering that showers come during the day, nights account for a high percentage of 55%. A distinct congestion front is created between the cold and humid Okhotsk Sea air mass located on the northern Russian coast and the hot and humid North Pacific air mass near the Ogasawara Islands, resulting in a rainy season. However, in the case of the Korean Peninsula, not only the Okhotsk Sea air mass but also the cold and dry Siberian air mass contributes to the rainy season. Another cause of the rainy season is said to be the Bering Sea and the Tibetan Plateau. To be exact, the speed of high pressure formation varies depending on the amount of ice in the Bering Sea and the amount of snow accumulated in the Tibetan Plateau, as the rainy season begins with the speed at which each high pressure in the north and south of the Korean Peninsula moves. For this reason, rainy seasons are regarded as a kind of East Asian seasonal wind climate abroad. The rainy season ends when the North Pacific high pressure expands and the Okhotsk Sea fleet retreats. Since then, as the North Pacific high pressure began to dominate the Korean Peninsula, the heat wave began in earnest and entered the middle of summer. However, during the period from summer to autumn, as the North Pacific high pressure contracts and cold air expands in the north, the stagnant front moves south again and settles near the Korean Peninsula, which is called the "Autumn rainy season" or "second rainy season." The autumn rainy season generally occurs between late August and early September, and although it is usually shorter than the early summer rainy season, it sometimes pours more rain than the summer rainy season. Due to severe climate change caused by global warming in India, daytime temperatures have risen to 32 degrees Celsius since mid-April and 39 degrees in late April, resulting in a strong heat wave in mid-summer, which also hit Korea in early June this year. On August 30, 2022, the head of the Korea Meteorological Administration pointed out that it was impossible to predict the recent heavy