When does the nine-nine-day count begin? Which of the nine nines is the coldest?

Winter goes and spring comes, and the time has passed in a blink of an eye. This period of time means that the weather has gradually warmed up and spring is not far away. So when does the nine-nine days of 2021 begin? Which of the nine nine days is the coldest?

When does the Nine-Nine Days begin?

The nine-nine days will start on March 3, 2022 and end on March 11;

2022 Nine-Day Schedule

Day 1: March 3, 2022

Day 2: March 4, 2022

Day 3: March 5, 2022

Day 4: March 6, 2022

Day 5: March 7, 2022

Day 6: March 8, 2022

Day 7: March 9, 2022

Day 8: March 10, 2022

Day 9: March 11, 2022

Which of the nine nine days is the coldest?

The 39th and 49th days of the nine-day coldest period are the coldest.
There is a saying that goes, "Don't go out on the 19th and 29th days of the lunar month; walk on the ice on the 39th and 49th days of the lunar month; watch the willows along the river on the 59th and 69th days of the lunar month; the river blooms on the 79th day of the lunar month; swallows come on the 89th day of the lunar month; and oxen are seen everywhere on the 99th and 19th day of the lunar month." During the 39th and 49th days of the lunar month, the angle between the sun's direct angle and the ground is the smallest, and the intensity of sunlight per unit area of ​​the ground is the smallest. Therefore, the ground receives the least solar heat every day, but the daily heat deficit on the ground has not yet reached its maximum, so it is not the coldest time. After the winter solstice, although the angle between the sun's direct angle and the ground will increase, the daily heat balance of the ground is still in a deficit state, so heat continues to be lost and the ground temperature continues to drop. Generally speaking, the daily heat balance deficit of the ground reaches its maximum value during the "39th and 49th days of winter", which leads to the lowest temperature during the "39th and 49th days of winter".